A key House Republican said Tuesday he will move to obtain the reported memo in which former FBI Director James Comey says President Donald Trump asked him to end the probe into ex-advisor Michael Flynn.

House Oversight Comittee Chairman Jason Chaffetz tweeted that his panel “is going to get the Comey memo, if it exists.” The Utah Republican said he has his “subpoena pen ready.”

Chaffetz, who has a key role in executive branch oversight, recently announced he would not run for re-election next year.

Comey wrote in the February memo that Trump asked him to back off of the investigation into Flynn, his former national security advisor, NBC News confirmed Tuesday with multiple sources. It was written the day after Flynn resigned following revelations that he misled Vice President Mike Pence about the nature of his conversation with the Russian ambassador to the United States, according to NBC.

“I hope you can see your way clear to letting this go, to letting Flynn go,” Trump told Comey, according to a memo the former FBI director penned soon after the meeting, which was first reported by The New York Times.

In a statement provided to NBC News, a senior White House official pushed back against the reports.

“While the president has repeatedly expressed his view that General Flynn is a decent man who served and protected our country, the president has never asked Mr. Comey or anyone else to end any investigation, including any investigation involving General Flynn. The president has the utmost respect for our law enforcement agencies, and all investigations. This is not a truthful or accurate portrayal of the conversation between the president and Mr. Comey,” the official said in a statement.