In an appearance on Fox News' "Tucker Carlson Tonight," Rep. Jason Chaffetz, R-Utah, said Mueller is "as good as it gets" and that his credentials are "impeccable", but anxious that the investigation will be politically exploited by Democrats on a daily basis.
U.S. Rep. Jason Chaffetz said Thursday he will resign from Congress next month, a move that calls into question the future of the House Oversight Committee's investigation of President Donald Trump and his campaign's ties with Russian Federation.
The Republican congressman had already said last month he wouldn't run for re-election.
The coveted House Oversight gavel is due to change hands, as chairman Rep. Jason Chaffetz (R-Utah) steps down from Congress to become a cable TV commentator.
Chaffetz had previously said he may leave before the end of his term but did not give any timeline. Chaffetz said. "I physically don't know exactly where those lanes are".
"I think their sincerity is probably there", Chaffetz said.
As he told Carlson, Chaffetz has great respect for the newly appointed special counsel set to lead the investigation - former FBI Director Robert Mueller - but says he's not quite sure what exactly Mueller has to investigate.
The committee has been looking into whether President Donald Trump may have asked former Federal Bureau of Investigation Director James Comey to back off the investigation of former national security adviser Michael Flynn shortly after Mr. Flynn had resigned.More news: Trump to delay decision on Paris climate agreement until after summit
But, Chaffetz said no one particular investigation is enough to keep him in office, though he did say there were several investigations he wishes he could have finished.
Chaffetz's exit will accelerate internal jockeying among House Republicans to succeed him as the chairman of the high-profile Oversight Committee.
Utah Gov. Gary Herbert, a Republican, said he spoke with Chaffetz on Wednesday but said he doesn't know what the Chaffetz' plans are for leaving Congress.
"I hope you can see your way clear to letting this go, to letting Flynn go", Mr. Trump told Mr. Comey, according to the memo.
He said he and his wife will be empty nesters soon and it seems like a good time to turn a page.
Gowdy also issued a statement later in the day praising Chaffetz for his service.
At that time, he said he meant to return to the private sector, though he did not rule out running for public office again at some point. "Quite frankly, I believe the country deserves a woman or a man who is devoid of political taint".