Trump and Cruz argue over who's a bigger liar
 
"You know, Donald has a tenuous relationship with the truth," Cruz said, after the GOP front-runner accused him of being the biggest supporter of Supreme Court Chief Justice John Roberts, who upheld Obamacare twice. 
 
Trump had just argued that Cruz was the prime mover behind Roberts's nomination. Cruz did in fact write an op-ed supporting Roberts after he was nominated by then-President George W. Bush, but the Texas senator said he wouldn't have made the nomination himself.
 
"That's not what you said in the op-ed," Trump said before adding his nickname for Cruz: "Lying Ted."