Republican presidential front-runner Donald TrumpDonald John TrumpFive landmark moments of testimony to Congress Lindsey Graham basks in the impeachment spotlight Democrats sharpen their message on impeachment 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 CruzTrump circuit court nominee in jeopardy amid GOP opposition Trump has officially appointed one in four circuit court judges On The Money: Retirement savings bill blocked in Senate after fight over amendments | Stopgap bill may set up December spending fight | Hardwood industry pleads for relief from Trump trade war 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.”