Former Clinton press secretary says Sanders should give Trump an ultimatum: Don’t lie again or I’ll quit

A former press secretary is calling for Sarah Huckabee Sanders to issue an ultimatum to President Trump: Don't lie to me again, or I'll quit.

"I think at this point, I'd go into the Oval Office and tell the president that if he lies to me again, I have to quit," Joe Lockhart, who served in former President Clinton's administration, said on "CNN Newsroom" on Saturday.

"I think she runs the risk, it's at the stage where she's complicit in the lies, even though she may not have the best information," he continued, referring to the current White House press secretary.

Lockhart added that Sanders "now knows for certain that the president is a liar."

"We now know, without any shadow of a doubt, that the president will say whatever is in his interest at that moment and has no regard for the truth. So she knows this," Lockhart said.

Sanders faced intense questioning from reporters after it was revealed last week that Trump had reimbursed his personal attorney for the $130,000 payment made to adult-film star Stormy Daniels days before the 2016 election. 

Trump had previously told reporters that he didn't know about the payment, which was meant to keep Daniels, whose legal name is Stephanie Clifford, from speaking publicly about her claims of an affair with the president. Sanders told reporters that she had "given the best information I had at the time."

Sanders also told reporters that she first learned about Trump reimbursing Cohen for the payment when Trump attorney Rudy Giuliani revealed it on Fox News last week.