Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE lashed out at former GOP presidential nominee Mitt Romney and questioned his religion in a campaign rally in Mormon-heavy Utah.

"Do I love the Mormons? OK, I love the Mormons," Trump said to cheers.

"By the way, Mitt Romney is not one of them ... Are you sure he's a Mormon? Are we sure?"

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Trump and Romney have been in a heated feud – Romney has been outspoken in his opposition to Trump as the party's nominee. Earlier Friday, Romney announced that he would be voting for Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE in Utah because he's the best chance to keep Trump from winning there Tuesday, even though he has previously supported John Kasich.

Trump, who has claimed a surprising portion of the Evangelical vote, has made a play for Mormon voters as the Utah caucuses approach.

Going to Salt Lake City, Utah, for a big rally. Lyin' Ted Cruz should not be allowed to win there - Mormons don't like LIARS! I beat Hillary — Donald J. Trump (@realDonaldTrump) March 18, 2016

Trump's rally in Salt Lake City is his first since a big primary day on Tuesday, where he won four states and is slightly ahead of Cruz in Missouri, which has yet to make a final call on results.