Sarah Sanders only stops lying when she's being threatened with jail: CNN's Joe Lockhart

Special counsel Robert Mueller's report on Russian interference in the 2016 presidential election has revealed that White House press secretary Sarah Huckabee Sanders has knowingly told multiple lies during her time working for President Donald Trump.

CNN political analyst Joe Lockhart, who served as press secretary under former President Bill Clinton, mocked Sanders on Monday for being so shameless in lying to the American public -- only to immediately admit the truth when being interviewed by Mueller's team.

"When she knew... she could go to jail, join Paul Manafort in a jail cell, it became clear to her that she needed to tell the truth," Lockhart said.

Lockhart went on to document that the lies Sanders has been telling haven't been harmless white lies, either -- in fact, she smeared the reputation of former FBI Director James Comey by falsely claiming "countless" FBI agents had expressed gratitude for Trump's decision to fire him in 2017.

"If you look at the lie she told, she knew James Comey was being fired because of the Russia investigation," he said. "She participated in the obstruction of justice to smear James Comey in order to slow down or stop this investigation. Yes, she has no credibility. I think there is a much bigger thing here: She participated in the effort with President Trump in order to obstruct justice."

Watch the video below.