U.S. Rep. Jason Chaffetz and his wife Julie speak with reporters at their home Thursday, May 18, 2017, in Alpine, Utah. Rep. Jason Chaffetz said Thursday that he will resign from Congress next month, a move that calls into question the future of the House Oversight Committee's investigation he promised to lead about President Donald Trump's firing of the FBI director and his presidential campaign's ties with Russia. (AP Photo/Rick Bowmer)

U.S. Rep. Jason Chaffetz and his wife Julie speak with reporters at their home Thursday, May 18, 2017, in Alpine, Utah. Rep. Jason Chaffetz said Thursday that he will resign from Congress next month, a move that calls into question the future of the House Oversight Committee's investigation he promised to lead about President Donald Trump's firing of the FBI director and his presidential campaign's ties with Russia. (AP Photo/Rick Bowmer)

ALPINE, Utah (AP) — Rep. Jason Chaffetz announced Thursday he will resign from Congress next month, saying a “mid-life crisis” had compelled him to step away from his chairmanship of the House Oversight Committee just as it is poised to investigate President Donald Trump’s firing of the FBI director.

The announcement by Chaffetz, 50, was the latest upending of the Republican-controlled congressional investigations into Trump.

Chaffetz’s announcement came a day after he tweeted that he had invited ex-FBI Director James Comey to testify next week at a hearing of the oversight committee he leads.

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Comey was fired last week amid an FBI investigation into whether Trump’s presidential campaign associates colluded with Russia to influence the presidential election outcome to benefit him.

Chaffetz, a Utah Republican who had just started his fifth term in Congress, used his post as chair of the oversight committee to doggedly investigate Hillary Clinton before the 2016 presidential election and raise his political profile.

But Trump complicated Chaffetz’s life. He rescinded his endorsement of Trump last year after recordings surfaced of the reality show star bragging about groping women, only to hastily re-endorse Trump shortly before the FBI announced it was reviving its investigation into Clinton’s emails.

After Trump won the election, Chaffetz became a lightning rod for criticism that Republicans weren’t aggressively policing Trump.

Liberals said that he did not go after the incoming administration with nearly the vigor used against the prior Democratic administration. Constituents booed him at a raucous February town hall, and a novice Democratic candidate raked in hundreds of thousands of dollars in online donations when she announced her longshot challenge to him weeks later.

Last month, Chaffetz stunned the political world by saying he would leave Congress before his current term ends in 2018. But he did not provide a date for his departure until Thursday.

On Tuesday, Chaffetz took his first aggressive steps against the Trump administration. He vowed to get the memos Comey reportedly wrote about his meeting with Trump in which the president allegedly asked him to shut down the FBI investigation into ousted National Security Adviser Michael Flynn.

He told reporters Thursday from his home in a Salt Lake City suburb that he still has not seen the Comey memo or spoken with the former FBI director.

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He said he believed other members of his committee would keep the investigation going.

“There are lots of good people who care about these issues and are well-suited to carry out these investigations,” Chaffetz said.

Chaffetz is the second House Republican who is stepping away from a Trump investigation. Rep. Devin Nunes, the chairman of the House Intelligence Committee, had to recuse himself from that investigation after a bizarre incident where he emerged from the White House and seemed to suggest he had evidence backing up Trump’s groundless contention that he had been surveilled by the Obama administration. Republican Rep. K. Michael Conaway is now overseeing that probe.

One possible replacement for Chaffetz on the committee is Rep. Trey Gowdy, a Republican and former South Carolina prosecutor who chaired the special Benghazi investigative committee and a close Chaffetz friend. On Thursday, Gowdy released a statement saying he was talking to other members about the chairmanship.

Chaffetz said his last day will be June 30. He said he hoped to preside over one final hearing on a botched Obama administration “gun-walking” program, in which federal authorities let gun-runners purchase firearms in hopes of disrupting gun smuggling rings.

Chaffetz, a former kicker for the Mormon-owned Brigham Young University football team, was first elected to the U.S. House of Representatives in 2008. He strolled to four-easy re-elections in his heavily Republican district that stretches from towns in the Wasatch Mountains to the Salt Lake suburbs and Provo, home of Brigham Young University. Chaffetz became chairman of the House Oversight Committee in 2015.

He has not ruled out running for another office, such as Utah governor.

Prior to his time in office, he worked in communications for more than a decade and served as campaign manager for former Utah Gov. Jon Huntsman Jr.

Sitting on his couch with his wife Julie and petting their dog, a Cavalier King Charles Spaniel named Ruby, Chaffetz said he had been stunned by two of his children’s upcoming moves from Utah and the realization he and his wife would be empty-nesters soon.

“I kind of had a little bit of a midlife crisis. I turned 50, I’m sleeping on a cot,” Chaffetz said of his life as a congressman in Washington. “The overwhelming driving force is the idea that I just love my family. And a lot of people will never ever believe that, but that is the truth.”