Republican presidential front-runner Donald Trump took a swing at Mitt Romney Friday night, suggesting that the 2012 GOP nominee is not, in fact, a Mormon.

Just seconds after telling a crowd of Utah voters he "love[s] the Mormons," the billionaire questioned whether Romney actually belongs to the Mormon Church.

"Are you sure he's a Mormon?" Trump said of Romney during his latest rally in Salt Lake City. "Are we sure?"

The New York businessman also called Romney a "choker" for his failure to take back the White House from President Obama in 2012.

"By the way, I have a lot of friends — Mitt Romney is not one of them," Trump told a rambunctious crowd. "Did he choke? He's a choke artist. It was so sad."

Romney announced on Facebook Friday that he plans to vote for Trump's leading opponent, Texas Sen. Ted Cruz, in Utah's Republican primary next Tuesday.

"Today, there is a contest between Trumpism and Republicanism," he wrote on his personal Facebook page. "Through the calculated statements of its leader, Trumpism has become associated with racism, misogyny, bigotry, xenophobia, vulgarity and, most recently, threats and violence. I am repulsed by each and every one of these."

Trump currently trails Cruz in the Beehive State and has had difficulties previously finding support among Mormon voters. He is set to travel to Arizona, which will also hold its primary March 22.