CNN anchor John Berman mocked 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's lawyer Rudy Giuliani on Monday for his declaration that “truth isn’t truth.”

“I want to make one correction to something you just said,” Berman said to co-anchor Alisyn Camerota on Monday after she began their “New Day” program by stating the day and date.

“It's not Monday. You said it is Monday. I’m declaring it is not Monday, and it’s not because I say it’s not,” Berman said.

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“I’m giving myself this new presidential power that Rudy Giuliani just created yesterday,” Berman continued. “Monday isn't Monday. The sky is not blue. Water isn't wet. And truth is not truth.”

“The president's lawyer actually declared this in the latest edition to the ‘Things Said Out Loud’ file,” Berman said. “He said it trying to explain why he doesn’t want the president to testify to the special counsel.”

Giuliani, the former Republican mayor of New York City who joined the Trump legal team in April, made the “truth isn’t truth” comment while appearing Sunday on NBC’s “Meet the Press" with Chuck Todd on Sunday.

In an effort to explain why the president hasn’t sat for an interview with investigators in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's Russia probe, Giuliani said he doesn’t want Trump to be “trapped into perjury.”

“And when you tell me that he should testify because he’s going to tell the truth and he shouldn’t worry, well that’s so silly because that’s somebody’s version of the truth, not the truth,” Giuliani said.

“Truth is truth,” Todd responded.

“No it isn’t,” Giuliani replied. “Truth isn’t truth.”

Giuliani attempted to clarify the comment on Monday, explaining he was laying out a “he said, she said” scenario.

“My statement was not meant as a pontification on moral theology but one referring to the situation where two people make precisely contradictory statements, the classic ‘he said, she said’ puzzle. Sometimes further inquiry can reveal the truth other times it doesn’t,” Giuliani tweeted.

My statement was not meant as a pontification on moral theology but one referring to the situation where two people make precisely contradictory statements, the classic “he said,she said” puzzle. Sometimes further inquiry can reveal the truth other times it doesn’t. — Rudy Giuliani (@RudyGiuliani) August 20, 2018

Giuliani's comment dominated cable news on Monday morning, particularly on CNN and on MSNBC's “Morning Joe.”