President Trump denied a report Thursday that he made a troubling "promise" to a foreign leader that left a whistleblower alarmed, insisting he would never say anything "inappropriate" on such a call.

Trump responded Thursday to a report from The Washington Post that an official in the U.S. intelligence community filed a complaint in August about the president's communications with a foreign leader. Trump reportedly made a "promise" on a phone call that the whistleblower found so troubling they filed a complaint to Intelligence Community Inspector General Michael Atkinson, who marked it of "urgent concern."

The president denied this report by asking if anyone is "dumb enough" to believe he would "say something inappropriate" to a foreign leader on a phone call since "there may be many people listening" to it. That seemed to be suggesting that he only wouldn't say anything inappropriate because people are listening in, although he then added that he would "only do what is right anyway."

It wasn't hard for reporters to fact-check Trump's assertion that the idea of him saying something inappropriate to a foreign leader is so unbelievable, with The Washington Post's Josh Dawsey recalling the president telling Russian officials in the Oval Office that he fired FBI Director James Comey, a "real nut job," and that this has now taken "pressure" off himself. Trump also reportedly revealed highly classified information in a 2017 Oval Office meeting with Russia's foreign minister and ambassador.

It's unclear which foreign leader Trump's reportedly troubling conversation might have been with, and on Thursday, The New York Times reports Atkinson wouldn't provide lawmakers with any information about the complaint and would not even confirm whether it involves Trump at all. Brendan Morrow