Special Counsel Robert Mueller accused Paul Manafort on Monday night of violating his plea deal by lying to investigators - a move that could potentially lead to more jail time for the former Donald Trump campaign chairman.

Mueller's team said Manafort, who was convicted earlier this year on multiple counts of financial fraud in connection to his work as a political consultant in Ukraine, "committed federal crimes" by lying to Mueller's team and the FBI about a "variety of subject matters."

Fox News Senior Judicial Analyst Judge Andrew Napolitano joined Fox News Radio's Guy Benson and Marie Harf to discuss Mueller's accusation against Paul Manafort. 

On Mueller accusing Manafort of lying: By Mueller accusing Manafort of lying he is effectively saying you have violated the terms of your plea agreement. Therefore, we are going to ask the judge to sentence you to the maximum time rather than asking for a break. Manafort's lawyers say, 'Wait a minute. He didn't lie.' That's very dangerous for Manafort and for the President because now we have an issue of fact, did he lie or did he not? In order for Mueller to get what he wants from the judge he must demonstrate to the judge that Manafort lied. (2:08)

On Manafort's plea agreement: It's almost inconceivable that he would have lied as Mueller said because he has so much to lose. The plea agreement if you recall it was 175 pages long. Of course I read it. I've never seen a plea agreement like this in my life in this respect because he not only pleaded guilty to the crimes for which he was indicted, but he pleaded guilty to state crimes, emphasize on state crimes for reason's you and your listeners understand. They are not subject to president's pardon.  (5:05)

On if the Mueller protection bill is unconstitutional: I haven't seen it, but I'm generally sympathetic to Senator Lee's analysis that the Congress cannot take away from the President the ability to fire Mueller for cause. (8:59)

On Trump wanting to change immigration law: I understand the President's wish for order.  It is obviously for efficient for the government if asylum seekers came in through the legitimate portals that the government has established where the Border Patrol is there ready to process their applications. I understand the President's political wish to keep asylum seekers from entering the country at all until the asylum has been adjudicated.  Unfortunately, that's not the law. The President has to enforce the law. The law is crystal clear. A: An asylum seeker can enter the United States any way he or she can.  B: They have a right to stay here perhaps in detention, that's a lawful detention,  until the asylum is adjudicated.  (11:27)