touted a national poll showing 68% of his followers would follow him if he ran as an independent. trump also bolstered his argument with another poll which claimed that 25% of muslims in this country believe violence against america is justified. but one of the leading trackers of hate groups, the southern poverty law center, describes the head of the center for security policy, frank gaffney, as one of america's most notorious islam phonesislamaphobes. one tweeted mr. trump stokes hatred. the mayor of london called it utter nonsense. johnson said the only reason i wouldn't go to some parts of new york is the real risk of meeting donald trump. the controversy, of course, follows the san bernardino attack in which tash feen mallic

>> we want to find out everyone who profited from it, financed it. and i'm not saying there is anything like that. but we will leave no stone unturned. >> reporter: farook's co-workers had active shooter training one year ago. in a chilling twist, it was in the very room where the attack occurred, but it's unknown if farook attended. >> one of the victims of the a hero. 45-year-old shannon johnson of los angeles shielded a wounded colleague during the attack. she survived but johnson was killed. we spoke to the long time girlfriend. he reports from a memorial. >> reporter: you are about to see what happened when the girlfriend showed up relatively unknown. this is a crisis counselor, but on the morning massacre, the crisis was hers. >> the text i sent was hey, mass shooting out that way.

ted cruz, a lawyer himself, refused to say whether trump's proposal was constitutional. >> i recognize a great many that anyone running for president engage in an ongoing, as an ongoing theater critic, criticizing the proposals of others. i don't agree with his proposal. i don't think it's the right solution. >> reporter: legal scholars say the ban would violate numerous treaties, and ilyas shapiro says the proposal is -- >> wholly unconstitutional. i wish our law school exams were like this. what is the problem with this statement? ou can't treat people differently on the basis of religion. you can't discriminate against them on that basis. case closed. >> reporter: despite the uproar, candee parker backed the gop front runner. >> the idea that he is okay with being out there and saying what he believes and not being afraid, and having a backbone to say it, i'm okay with that.