President Trump's ex-bodyguard Keith Schiller testified before the House Intelligence Committee this week, and he said his old boss declined an offer from a Russian who offered to "send five women" to his Moscow hotel room back in 2013.
Two of the sources said Schiller viewed the offer as a joke, but quickly responded, "We don't do that type of stuff".
"This conduct is indefensible and calls into question the credibility and motives of the Committee's investigation", attorney Stuart Sears said of the leaks.
These allegations were found in the dirty dossier, intelligence gathered by former British intelligence officer Christopher Steele, which was opposition research partially financed by an unnamed Republican, along with Hillary Clinton's campaign and the Democratic National Committee.
Schiller described his reaction to the allegation "bullshit". Among the claims was that during his Moscow trip, Trump employed prostitutes to urinate on a hotel room bed once slept in by President Barack Obama and first lady Michelle Obama.More news: City of Las Vegas
When asked about the offer, Schiller said that he could not recall who it was that made it.
When Donald Trump left NY to take up residency in the White House, Keith Schiller, his longtime bodyguard, went with him.
Later that night, Schiller, a former NYPD cop, said he and Trump had a good laugh about the incident. But he also admitted that he couldn't be sure what happened after he left Trump's hotel door. In June 2016, Goldstone connected with the President's eldest son, Donald Trump Jr., at the request of Aras Agalarov to set up the meeting at Trump Tower with Russian lawyer Natalia Veselnitskaya.
Keith Schiller spoke to the committee on Tuesday in a closed-door interview, but three sources confirmed the topic to NBC News.
Schiller's lawyer denied leaked accounts of his client's testimony, calling them "blatantly false and misleading".
Schiller, who is one of Trump's closest confidants, left the White House in September after serving as director of Oval Office operations.