WASHINGTON — Secretary of State Mike Pompeo swatted away questions about his use of government resources again and again last year.
In January, news reports cited unnamed diplomats complaining about his wife, Susan, traveling with him across the Middle East during a partial government shutdown.
In the summer, members of Congress began examining a whistle-blower complaint accusing Mr. Pompeo of asking diplomatic security agents to run errands like picking up restaurant takeout meals and retrieving the family dog, Sherman, from a groomer.
And in October, a Democratic senator called for a special counsel to investigate his use of State Department aircraft and funds for frequent visits to Kansas, where he was reported to be considering a Senate run.
In each case, Mr. Pompeo or other department officials denied wrongdoing, and the secretary moved on unscathed. But his record is now coming under fresh scrutiny after President Trump told Congress on Friday night that he was firing the State Department inspector general — at Mr. Pompeo’s private urging, a White House official said.
The inspector general, Steve A. Linick, who leads hundreds of employees in investigating fraud and waste at the State Department, had begun an inquiry into Mr. Pompeo’s possible misuse of a political appointee to perform personal tasks for him and his wife, according to Democratic aides. That included walking the dog, picking up dry-cleaning and making restaurant reservations, one said — an echo of the whistle-blower complaint from last year.
The details of Mr. Linick’s investigation are not clear, and it may be unrelated to the previous allegations. But Democrats and other critics of Mr. Pompeo say the cloud of accusations shows a pattern of misuse of taxpayer money — one that may mean lawmakers will be less willing to give the administration the benefit of the doubt as congressional Democrats begin an investigation into Mr. Linick’s dismissal.
The investigation is aimed at determining whether the act was one of illegal retaliation intended to shield Mr. Pompeo from accountability — which “would undermine the foundation of our democratic institutions,” Representative Eliot L. Engel of New York and Senator Bob Menendez of New Jersey, leading Democrats on foreign policy committees, said in a joint statement.
Mr. Linick is the fourth inspector general to fall in a purge this spring by Mr. Trump of officials he has deemed insufficiently loyal, but the dismissal is the first to prompt a formal inquiry in Congress, and it has also drawn criticism from a few Republicans.
“The president has the right to fire any federal employee,” Speaker Nancy Pelosi said on CBS’s “Face the Nation” on Sunday. “But the fact is, if it looks like it is in retaliation for something that the I.G., the inspector general, is doing, that could be unlawful.”
She called the move “unsavory” — “when you take out someone who is there to stop waste, fraud, abuse or other violations of the law that they believe to be happening.”
Aides to Mr. Pompeo did not reply to repeated requests for comment. The White House did not respond to questions about whether it knew of Mr. Linick’s investigation into Mr. Pompeo when it moved to dismiss him.
Mr. Linick’s office has not commented on that inquiry or on Mr. Trump’s announcement, which started a 30-day clock on the inspector general’s departure. Employees under Mr. Linick generally view him as competent and nonpartisan. Mr. Linick began his current job in 2013, and he held senior posts in the Justice Department starting in the administration of President George W. Bush. Mr. Linick played a minor role during the impeachment hearings last fall.
A few Republican senators, notably Mitt Romney and Charles E. Grassley, have expressed varying degrees of disapproval of Mr. Trump’s move. But on Sunday, Senator Ron Johnson, Republican of Wisconsin, said: “I understand it. I don’t disagree with it.”
He told CNN that he had spoken with White House and State Department officials about the matter. “I’m not crying big crocodile tears over this termination, let’s put it that way,” he said.
Since Mr. Pompeo took up his current post in April 2018, and for more than one year before that as the C.I.A. director, he has been peerless in his navigation of Mr. Trump’s inner world of loyal advisers and domestic politics around foreign policy. While sticking close to Mr. Trump, he has weathered the impeachment process involving Ukraine, questions over the decision to kill a top Iranian general and the fraught diplomacy between the president and Kim Jong-un, the unpredictable leader of North Korea.
But the maelstrom of questions that began over the weekend could present a formidable challenge to Mr. Pompeo’s political instincts and career ambitions. People close to him say he is thinking of running for president in 2024. And more immediately, the Senate majority leader, Mitch McConnell, Republican of Kentucky, has repeatedly urged him to run for an open Senate seat in Kansas — an important race given that the Republicans are at risk of losing control of the Senate in the November elections.
Mr. Pompeo knows the potential effect of a congressional investigation on a politician’s career: As a Republican congressman, he helped lead the charge against Hillary Clinton, then the secretary of state, over the deaths of four Americans at a mission in Benghazi, Libya, an issue that hounded her during the 2016 presidential campaign.
For Mr. Pompeo, the spotlight now falls on much more personal matters, including the role of his wife. Other secretaries of state have occasionally traveled with spouses, but some officials in the State Department say Mrs. Pompeo, a former bank executive, has played an unusually active role in running meetings and accompanying her husband on official business.
“She has this quasi-official role, where my friends are called to meetings she is leading at the department,” said Brett Bruen, a former career diplomat and director of global engagement on President Barack Obama’s National Security Council. “They know that’s not supposed to happen, because she isn’t in their chain of command. But what can they do?”
Mrs. Pompeo has accompanied Mr. Pompeo on several long trips overseas. In January 2019, she went with him on an eight-day journey across the Middle East — which raised questions among some officials because most State Department employees, including those supporting the trip, were working without pay during a partial government shutdown. Mrs. Pompeo has also flown with her husband on multinight trips to Switzerland and Italy, which included a visit to the secretary’s ancestral home region of Abruzzo.
Mrs. Pompeo, who is not paid by the State Department, has met with embassy families and local figures on some of the trips, and Mr. Pompeo has called her a “force multiplier.”
Mrs. Pompeo also played an unusually prominent volunteer role at the C.I.A. when Mr. Pompeo was the director there; she traveled with her husband, used an office space in C.I.A. headquarters and asked employees to assist her — actions that an agency spokesman defended at the time. Their son also used a C.I.A. shooting range recreationally, according to CNN.
Mr. Pompeo’s frequent trips to Kansas last year also drew intense scrutiny. He went four times, three on the auspices of official business and flying in and out on State Department aircraft. To many, the trips appeared to be part of a shadow Senate campaign for 2020 and had little to do with foreign policy, despite Mr. Pompeo’s denials and his refusal so far to agree to run for the seat.
On the last trip, in October, Mr. Pompeo took part in a student event with Ivanka Trump, Mr. Trump’s daughter. And he discussed the Senate race with Charles Koch, the billionaire who is a longtime supporter of Mr. Pompeo, and Dave Robertson, the president and chief operating officer of Koch Industries, The Wall Street Journal reported.
The Kansas City Star ran a blistering editorial denouncing Mr. Pompeo’s frequent trips to his adopted home state, telling him he should quit and run for Senate or “by all means focus on U.S. diplomacy — remember diplomacy? — and stop hanging out here every chance he gets.”
Four days later, Mr. Menendez, the top Democrat on the Senate Foreign Relations Committee, sent a letter to the U.S. Office of Special Counsel asking it to investigate Mr. Pompeo for potential violations of the Hatch Act, which bars federal employees from using their official positions to engage in partisan political activities.
Separately, Democratic lawmakers on a House committee last year began looking at a whistle-blower complaint that Mr. Pompeo, his wife and adult son were asking diplomatic security agents to run personal errands, including picking up Chinese food and the family dog from a groomer. The whistle-blower said agents had complained they were “UberEats with guns,” according to CNN, which first reported on the accusations.
Lon Fairchild, the agent in charge of the Diplomatic Security Service, told CNN that he had seen no wrongdoing. The Democratic lawmakers did not open a formal inquiry.
More broadly, Mr. Pompeo has wrestled with managing the State Department, though he was initially hailed by many employees as a welcome change from Rex W. Tillerson, Mr. Trump’s first secretary of state, who was perceived as aloof and dismissive.
Last fall, current and former State Department officials criticized Mr. Pompeo for not vocally defending diplomats who were testifying in the impeachment inquiry and coming under attack from Mr. Trump, and for his own role in the earlier ouster of Marie L. Yovanovitch, a respected career diplomat, from the ambassadorship to Ukraine.
Since the winter, Mr. Pompeo has also found himself on unsteady ground on policy amid the coronavirus pandemic.
Usually outspoken on policy matters, he seemed to play a more subdued role early in the crisis. Then he chose to pull back from diplomacy with China, where the outbreak began, and relentlessly criticized the Chinese Communist Party for its actions. He pushed spy agencies to look for evidence to support an unsubstantiated theory that the outbreak began in a virology laboratory in the city of Wuhan, and later said there was “enormous” and “significant” evidence behind the theory even when many scientists and intelligence analysts argued otherwise.
David E. Sanger and Emily Cochrane contributed reporting.