President Trump on Monday denied the hush-money payments to porn star Stormy Daniels and Playboy model Karen McDougal in the weeks leading up to the 2016 election were campaign contributions, instead calling them a "simple private transaction."

"So now the Dems go to a simple private transaction, wrongly call it a campaign contribution," Trump tweeted.

Fox News Senior Judicial Analyst and Host of the new Fox Nation show "Liberty File" Judge Andrew Napolitano joined Fox News Radio's Guy Benson and Marie Harf to talk about the Mueller investigation. 

On his advise to Trump if he was his attorney:  I would say you should take it with the gravity that it bears, which is very serious for him. So there's two areas that I know Rudy Giuliani is concerned about, not withstanding his public statements, which are intended to create an atmosphere among the public such that if the President were indicted or if the House were to vote on articles of impeachment the public would reject. I don't blame Giuliani for that, to that extent he's doing his job. But being the former U.S Attorney... I think he, Rudy, knows how serious these issues are.  (1:46)

On if he believes a sitting president can be indicted: I do and that belief is supported by Ken Starr, as well as the entire Whitewater team, which included a now person on the Supreme Court.  It is they who commissioned the one opinion that says the president can be indicted, but remember  they all that if there is an indictment he can't be prosecuted for a variety of reasons. (6:12)

On people comparing Trump to Clinton's impeachment: From the vantage point of 2018 the Bill Clinton impeachment seems frivolous. and highly inappropriate, whatever you think of him as a person, whatever you think of what he did with and to Monica Lewinksy and whatever you think of him as a politician. But, what did Bill Clinton do throughout that impeachment? Smiled, and his approval ratings went up.  The Democrats who are now talking impeachment should recognize that it's a political decision. They will do what they think will help them politically. (9:55)

On if it will be difficult to prove intent: If they can't prove intent they shouldn't indict. They shouldn't indict somebody if they don't think they can prove the commission of the crime. I think they can probably intend because they're going to Michael Cohen to tell them here's what we talked about. (13:42)