WATCH: Donald Trump just attacked 'unstable 'liar' Ted Cruz and 'choke artist' Marco Rubio

Donald Trump reinvigorated his attacks on Ted Cruz's "lies" during his South Carolina press conference on Monday.

"I have never, ever met a person that lies more than Ted Cruz," Trump told reporters. "I have never, ever seen anything like it." Trump repeated his accusations that he made during Saturday's debate about Cruz lying and playing dirty politics with Ben Carson in Iowa. He also called Cruz out on the "voter violation fraud" referring to

He also called Cruz out on the "voter violation fraud" referring to a leaflet the Cruz campaign sent out accusing Iowans of voting violations which Trump said the mainstream media didn't pick up on. "That was a fraud that he committed."

"He goes around saying he's a Christian? I don't know, you're really going to have to study that," Trump continued. After another question from reporters, Trump said that Cruz was an "unstable person. I watch him, I see him, and I always say he's a good debater but he can't talk ... I heard he was a good debater, I personally don't see he's a good debater, but he is a very unstable person. That's just my opinion."

"What he did with Ben Carson was terrible," Trump said returning once more to what happened in Iowa. "I've never seen anything like that. It was a total lie." Trump then said that Cruz called Carson only after the fact to apologize and that Carson didn't, in his mind, accept the apology. "So, I don't want to be in a position where it's Saturday evening and I get a phone call from him, 'You know I'm really sorry that! My staff did something...'"

Trump continued that most people can't fight the kinds of lies that Cruz tells but that he and his campaign absolutely intend to by using the press. "Now, he'll apologize, but I don't want an apology after the election. I want the apology before and if he doesn't I'm going to bring a lawsuit because, in my opinion, based on what I've learned over the last two, three days from very top lawyers he doesn't even have the right to serve as president."

When it comes to his opponent Marco Rubio, Trump was a little nicer simply pitying the Florida Senator. A reporter asked about attacks on Rubio but Trump couldn't remember where he had made any. "For what? Choking? Huh? For being a choke artist? Where did I attack him? For being a choke artist. And we can't have that as a president can we?" he asked the reporter. He also commented on both Cruz and Rubio not being able to take the pressure of the office much less the campaign trail. “I was standing next to Rubio and I thought he just got out of a swimming pool” Trump said about Rubio sweating.

Check out the videos below:

Rubio video: