Texas Sen. Ted Cruz's supporters unveiled an ad responding to new attacks from Donald Trump. Trump amped up his criticism of Cruz on Twitter following Thursday night's GOP presidential debate, and a pro-Cruz super PAC, Keep the Promise, responded with a new video. The ad plays audio of Trump heaping praise on Cruz as part of an introduction at a Lincoln Day fundraising dinner in Palm Beach, Fla., in 2014. "One of the reasons that I like Ted Cruz so much is that he's not controversial," Trump says in the ad to laughs from the audience. "But the truth is,...