Rep Adam Schiff Adam Bennett SchiffOvernight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings Democrats, advocates seethe over Florida voting rights ruling MORE (D-Calif.) on Sunday cast doubt on President Trump’s description of a dinner with former FBI Director James Comey.

“Well, the difficulty, and I look at this as former prosecutor, can you prove obstruction based on the president’s own words when we don’t know whether we can believe this president?” Schiff told CBS’s “Face the Nation.”

Schiff, who is leading the House Intelligence Committee’s investigation into Russia’s attempts to interfere in the election along with Rep. Mike Conaway (R-Texas), said if tapes of Comey’s conversations with Trump exist, as the president has suggested, then Congress should obtain them.

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“If there are tapes, of course, that would be the best evidence of what took place. If they exist, Congress needs to get them. If they’re not provided willingly, Congress should subpoena them,” said Schiff.

The president threatened Comey on Twitter early Friday morning, saying the former FBI head “better hope that there are no 'tapes' of our conversations before he starts leaking to the press!”

In a recent interview, the president also claimed that Comey told him during a January dinner that he was not under investigation by the bureau.

Last Thursday, a report emerged saying Trump asked Comey to pledge his loyalty to him during the dinner, which Comey refused to do.