The matter stems from a June 2016 meeting in Trump Tower with Donald Trump Jr., a Russian lawyer named Natalia Veselnitskaya, and several other Russians.
“If it’s what you say I love it,” Trump Jr. said in an email ahead of the meeting.
The spokesman for Trump’s legal team, Mark Corallo, spoke with Hicks in a call July 8 from the plane and became concerned about the statement’s misleading nature, ABC News was told by a source familiar with Corallo’s thinking.
According to another source close to Corallo, he had a second phone conversation with Hicks the next day, July 9, placed through the White House switchboard, about the Trump Jr. emails and the Trump Tower meeting - this time with the president listening in.
During that second call, the source said, when Corallo expressed his concerns, Hicks said of the emails, “Only a few people have them. They will never get out.”
According to the source, Corallo responded, “This is Washington. Everything gets out.”
Corallo made contemporaneous notes of that conversation, the second source said.
The New York Times first reported that Corallo was prepared to tell Mueller’s investigators about his conversations with Hicks.
A lawyer representing Hicks flatly denied the accounts.
“As most reporters know, it’s not my practice to comment in response to questions from the media. But this warrants a response,” attorney Robert Trout said in a statement. “She never said that. And the idea that Hope Hicks ever suggested that emails or other documents would be concealed or destroyed is completely false."
Corallo was unreachable for comment, and his lawyer, Victoria Toensing, said “Mr. Corallo is willing to cooperate with the special counsel.”
ABC News’ Katherine Faulders contributed to this report.