Feud Goes Nuclear as Trump Repeatedly Calls Cruz 'Unstable'

"It really is remarkable and it's quite odd that both Marco Rubio and Donald Trump respond the same way, which is that when anyone points to their actual records they get very upset and begin screaming 'liar, liar, liar,'" Cruz said last night on Hannity. "And that's just a very odd thing."

Separately, Rubio told Hannity, "I think Ted over the last few weeks has shown a propensity to say things that simply aren't true. And when you say something that's not true and you know it's not true, it's called a lie. And I just have a problem with it. He's not telling the truth about marriage. He's not telling the truth about the issue of Planned Parenthood, on my stance on life."

Ben Carson stepped into the fray on Fox to say "there's a difference between passion and, you know, trying to tear your opponent down."

"There's a big difference between that. So, you know, you can be very passionate about something, and but remember, when we put these things out there, the Democrats are going to use those in a general election," Carson said.

"They're just going to show those sound bites. They barely have to do anything if we tear ourselves apart. Somehow we've got to start learning and every single time it seems like the Republicans find a way to snatch defeat out of the jaws of victory."