Conservative media personality and Trump supporter
"Just look at Cruz's face: it's got career scum politician, aka liar, written all over it."
Republican senator from Arizona
"You know, it's always the wacko birds ... that get the media megaphone," he said referring to Mr Cruz and others. Mr McCain has also cast doubt on whether the Canadian-born Cruz was eligible to be president.
Former Republican congressional aide
"Cruz is an army of one, alienating anybody who is in his path. He advocates losing strategies purely to further his own career at the expense of the party."
Former Republican senator from Kansas
Speaking on the presidential race: "We need somebody with experience and there are a lot of good candidates -- I like nearly all of them. Except Cruz."
George W Bush
Former Republican president; Mr Cruz worked on his staff during his 2000 campaign
"I just don't like the guy," the fellow Texan told Republican donors privately in October.