Republican presidential front-runner Donald TrumpDonald John TrumpProtesters tear down statue of Christopher Columbus in Baltimore 'Independence Day' star Bill Pullman urges Americans to wear a 'freedom mask' in July 4 PSA Protesters burn American flag outside White House after Trump's July Fourth address 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 administration grants funding extension for Texas testing sites Hillicon Valley: Democrats introduce bill banning federal government use of facial recognition tech | House lawmakers roll out legislation to establish national cyber director | Top federal IT official to step down GOP lawmakers join social media app billed as alternative to Big Tech 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.”