Republican presidential front-runner Donald TrumpDonald John TrumpForget the spin: Five unrefuted Mueller Report revelations Lara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' Financial satisfaction hits record high: survey MORE thinks there's not much he could possibly do to erode his support.

Lauding his fans' loyalty at a campaign event in Sioux Center, Iowa, on Saturday, Trump said he could kill people and still be popular.

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“I have the most loyal people, did you ever see that? I could stand in the middle of Fifth Avenue and shoot people and I wouldn’t lose voters,” he said.  

Trump made the comments as he laid into National Review, the conservative magazine that published a series of essays criticizing him. Those who submitted essays against Trump include Glenn Beck and Brent Bozell, two conservative figures who endorsed GOP presidential rival Ted CruzRafael (Ted) Edward CruzO'Rourke to give commencement address at Texas's oldest black college Cornyn campaign, Patton Oswalt trade jabs over comedian's support for Senate candidate MJ Hegar announces Texas Senate bid MORE

At the speech, Trump floated the prospect of suing Cruz over whether he’s eligible to run for president and also warned that Christianity was under “siege.”