CNN analyst Carl Bernstein said Friday it would be “very, very damaging” for President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE if he knew about his son’s meeting with Russians in Trump Tower before it happened.

Bernstein, the former Washington Post reporter who broke the Watergate story, reported on Thursday that Trump’s former longtime attorney Michael Cohen says Trump had prior knowledge about the June 2016 meeting between his campaign officials and Russians.

“It would be a stunning development if the president of the United States — then about to become the nominee of his party — knew of that meeting in advance because the meeting itself that did take place suggests a kind of collusion in the sense that those present expected to receive information from the Russian participants,” Bernstein said.

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“If the president knew about this in advance, it is a very, very damaging piece of information, especially while he and his campaign are under investigation by the special prosecutor,” he added.

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Trump Jr. was told by music producer Rob Goldstone, who arranged the meeting, that a Russian lawyer was poised to offer information that “would incriminate Hillary and her dealings with Russia and would be very useful to your father.”

Trump has said he had no knowledge that the meeting was taking place, and in a series of Friday morning tweets accused Cohen of making up the story.

"And so the Fake News doesn’t waste my time with dumb questions, NO, I did NOT know of the meeting with my son, Don jr," Trump wrote on Friday.

Bernstein suggested that either Trump or Cohen could be lying.

Although Cohen is looking for a “get out of jail free card” by cooperating with special counsel investigators, Bernstein noted that Trump often finds “wiggle room” when it comes to the truth.

“Sometimes he’s been truthful about some matters, but he also sometimes finds some wiggle room,” Bernstein said. “Whether any wiggle room is possible here in the two versions, I have no idea.”