Chaffetz's statement insisted he was confident he would be re-elected by large margins were he to run again, and that a Republican would succeed him.
Wednesday's announcement capped an eventful few months for Chaffetz. "I expect to be involved and engaged in politics", he said in the interview, the Salt Lake Tribune reported. The campaign has sputtered without support from House leadership. That would likely be too much of a wildcard for GOP leaders, who have so far steered clear of investigating Trump's finances or business dealings.
From his Oversight perch, Chaffetz has also vowed to aggressively step up congressional oversight of the District of Columbia.
But he refused to look into contacts that Trump's national security adviser, Michael Flynn, had with a Russian official amid suspicions that Moscow played a role in influencing the USA elections.
While Chaffetz declined to investigate Trump, he did criticize a top Trump aide who promoted Ivanka Trump's fashion line during a cable TV appearance from the White House. The situation with Flynn was "taking care of itself", Chaffetz said.
Chaffetz has refused to initiate probes into potential financial conflicts of interest in the Trump White House, as well as into former National Security Adviser Michael Flynn's cozy ties to Russian Federation.More news: Israeli troops kill Palestinian who rammed West Bank bus stop: army
The 50-year-old Chaffetz had strolled to four easy re-elections in his Republican-friendly congressional district.
After the infamous Access Hollywood tape was revealed last October, Chaffetz said that he couldn't endorse Trump "in good conscience," but less than three weeks later, he tweeted that he would still vote for him, because "HRC is that bad".
Chaffetz now heads the House Oversight and Government Reform Committee, and has come under fire for not digging into conflict of interest concerns about President Trump or Russia's efforts to meddle in the election. Their relationship deteriorated after Chaffetz endorsed Mitt Romney over Huntsman in the 2012 Republican presidential primary. "I've already invested years in the House and it's essentially the same job, just more people over here and more competition".
Trump was still not expected to win the election. "It's a target-rich environment", he said, seeming to assume Clinton would beat Trump. Allen took issue with Chaffetz's comments about the need for low-income Americans to make purchasing healthcare more of a priority than buying the latest iPhone.
Democratic Congressional Campaign Committee spokesman Tyler Law also called for Chaffetz to give up his chairmanship and said his "behavior has always been beneath the dignity" of the office he holds. The other two candidates were Rep. Mike Turner, R-Ohio, and then-Rep.