Republican Donald Trump says "terrible intelligence-gathering" is hampering efforts to protect the United States.
"This is a case of surveillance," he said on CNN. "You will find that many people that knew him (the Orlando shooter) felt that he was a whack job."
Trump also said in a phone-interview with NBC's "Today" show that he would not support a ban on the sale of assault-style rifles in the wake of the weekend massacre at a gay nightclub in Orlando, Florida.
He told the network "there are millions" of such weapons already in circulation and said he didn't think instituting a ban would help.
"Absolutely, I wouldn't" support such a prohibition, the real estate mogul said, "because people need protection."
He said a ban essentially would mean "the bad guys would have assault rifles and the people needing protection will be standing there with BB guns."
Trump harshly criticized President Barack Obama for referring Sunday to a "terror" attack without going further. "He's not calling it what it is," Trump said. "This is radical Islamic terrorism. He doesn't want to properly describe it. And if you don't want to discuss it and describe it, you're not going to solve the problem."