Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti 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?"

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 CruzRafael (Ted) Edward CruzWith religious liberty memo, Trump made America free to be faithful again Interstate compacts aren't the right way to fix occupational licensing laws Texas Dem: ‘I don’t know what to believe’ about what Trump wants for wall 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.  

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.