Fox News’ Chris Wallace on Sunday pleaded with President Donald Trump’s personal attorney Rudy Giuliani to simply tell the truth during a wide-ranging, contentious interview.

The former New York City mayor danced around Wallace’s questions on special counsel Robert Mueller’s investigation and whether Trump had been truthful about hush money payments made to women who say they’ve had affairs with the president.

“Did the president know about the hush money payments or not?” Wallace asked Giuliani, referring to payments to porn star Stormy Daniels and former Playboy playmate Karen McDougal during Trump’s 2016 presidential campaign.

Federal prosecutors say the payments violated campaign finance laws.