Republican presidential front-runner Donald TrumpDonald John TrumpCorker: US must determine responsibility in Saudi journalist's death Five takeaways from testy Heller-Rosen debate in Nevada Dem senator calls for US action after 'preposterous' Saudi explanation 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 CruzElection Countdown: Small-donor donations explode | Russian woman charged with midterm interference | Takeaways from North Dakota Senate debate | O'Rourke gives 'definitive no' to 2020 run | Dems hope Latino voters turn Arizona blue White vote is 'fundamental problem' for Texas Dems, political analysts says Houston Chronicle endorses Beto O'Rourke in Texas Senate race 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.”