President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s lawyer Rudy Giuliani said late Monday that another member of the president's legal team made a “mistake” when he originally denied that Trump dictated a letter about the 2016 meeting between his son, campaign aides and a Russian lawyer.

“It was a mistake,” Giuliani said on CNN’s “Cuomo Prime Time” on Monday. “I swear to God, it was a mistake.”

Trump’s legal team wrote to 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 in January to argue that Trump cannot commit obstruction of justice in the Russia probe because of his constitutional authority.

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The letter also confirmed that Trump dictated a statement to The New York Times about the Trump Tower meeting between Trump's eldest son, other campaign aides and a Russian lawyer who promised compromising information on Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE.

Trump’s attorney Jay Sekulow and White House press secretary Sarah Huckabee Sanders previously denied that the president had any involvement in writing the letter.

“I don’t think anybody’s lying,” Giuliani said Monday. “I think a mistake was made.”

The former mayor of New York told CNN that those kinds of mistakes happen "all the time” in the early stages of an investigation.

No one testified falsely under oath, Giuliani also noted.

Giuliani was brought onto the Trump legal team in late April to represent him throughout the Justice Department’s investigation into Russian interference in the 2016 presidential election.

Giuliani said Monday that he only agreed with “70, 80 percent” of the January letter.

He said on ABC’s “This Week” on Sunday that the revelation of the contradicting statements serves as a reason why “you don’t let the president testify” with Mueller.

Giuliani said Sekulow was “uninformed” when he denied Trump had any involvement in the letter last year.

The admission has left Trump’s allies and legal experts scrambling to determine the legal ramifications of his involvement with the letter.