"Ted Cruz is a totally unstable individual. He is the single biggest liar I’ve ever come across, in politics or otherwise, and I have seen some of the best of them."

"His statements are totally untrue and completely outrageous. It is hard to believe a person who proclaims to be a Christian could be so dishonest and lie so much."

So begins "DONALD J. TRUMP RESPONDS TO THE LIES OF SENATOR CRUZ AND WARNS OF LEGAL ACTION."

ADDED: "Cruz says I am in favor of ObamaCare, when in fact I have spoken about repealing and replacing this disaster of a system at every speech throughout my campaign and since it’s inception." Can he not afford a copy editor?

AND: Key paragraph:

One of the ways I can fight back is to bring a lawsuit against him relative to the fact that he was born in Canada and therefore cannot be President. If he doesn’t take down his false ads and retract his lies, I will do so immediately. Additionally, the RNC should intervene and if they don’t they are in default of their pledge to me.

There's no direct connection between the lies he's citing as his motivation to sue and the ground for the lawsuit, the argument that Cruz is not a natural-born citizen. I know Trump has deal-making as his model for just about everything, but it comes across as a threat to file a lawsuit. He's also threatening to run as a third-party candidate, laying the groundwork, dragging the RNC into the conflict, demanding that it intervene or he's seeing himself as released from his pledge not to go third-party.