House Oversight Chairman Jason Chaffetz, R-Utah, announced Thursday that he would resign his seat in Congress at the end of June.

In a letter to his constituents, Chaffetz said he sent a letter to Utah Gov. Gary Herbert indicating his intention to leave office on June 30.

"I have very much enjoyed serving, but never for a moment have I thought that I was indispensable. I know others can and should serve," Chaffetz said. "The House is known as the 'People's House' because it is made up of a cross section of ordinary Americans who represent almost every walk of life — as it should be. While remaining true to my principles I have made the effort to 'reach across the aisle.' I count many Democratic members as my friends. I hope whoever replaces me will do even better."

Chaffetz announced last month that he would not be seeking re-election in 2018.

Chaffetz threatened this week to issue a subpoena to obtain copies of any memos written by fired FBI Director James Comey, following a report that Comey wrote in a memo that President Trump asked him to cease an investigation into former national security adviser Mike Flynn.

Following the appointment of former FBI Director Robert Mueller to be a special counsel in the FBI's investigation into Russian meddling in the 2016 election, Chaffetz said he has "not seen any evidence of actual collusion" between Trump and Russia.