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CNN's Chris Cuomo warns Rudy Giuliani about swearing to God while discussing Russia investigation

During an interview with CNN's Chris Cuomo on Monday night, Rudy Giuliani was adamant that President Trump's lawyers aren't lying when they say things that are ultimately proven to be false.

"You think maybe someone could have made a mistake?" Giuliani asked Cuomo, who had just pressed him about the shifting story coming out of the White House regarding the June 2016 meeting Donald Trump Jr. had in Trump Tower with Russians promising dirt on Hillary Clinton. Trump attorney Jay Sekulow and White House Press Secretary Sarah Huckabee Sanders both publicly said the president had nothing to do with a statement written about the meeting, but a newly revealed letter Sekulow co-wrote to Special Counsel Robert Mueller in January admitted that Trump had actually dictated it.

"You think Jay Sekulow lied?" Giuliani continued. "Maybe he just got it wrong. ... This is a complex investigation." Giuliani said he's gotten plenty of details wrong about the Russia probe, and because our memories can fail us, it would be dangerous for Trump to go under oath. "You can make a mistake, if you want to you can say it's a lie, it was a mistake," he said. "I swear to God it was a mistake."

Cuomo responded by giving Giuliani a friendly tip. "Be careful about swearing to God when you're in Jerusalem," he said. "It may carry a little more weight right now with the answers that you give." Giuliani laughed, and said he "heard something." "It's a thundercloud," Cuomo retorted. "Be careful." Watch the entire interview in the video below. Catherine Garcia