Romney’s comments came as he campaigns in advance of a June 26 Republican primary in the race to replace retiring Sen. Orrin G. Hatch (R-Utah).
Last month, delegates at the Utah GOP’s state convention denied Romney their party’s nomination outright as Mike Kennedy, a three-term state representative who entered the race just weeks earlier, edged out the establishment favorite with 50.88 percent of the vote to 49.12 percent.
The close result secured ballot slots for Romney and Kennedy in the primary contest.
Kennedy has sought to make an issue of Romney’s past antipathy for Trump an issue in a primary that Romney, a former governor of Massachusetts, is heavily favored to win.
Kennedy, however, acknowledged after a debate with Romney on Tuesday that he wrote in Sen. Ted Cruz (R-Tex.) for president in 2016.
Since launching his bid, Romney has offered praise for many of Trump’s policies while still criticizing his character.
Earlier this week, Romney told NBC News that he would not consider Trump a role model for his grandchildren “on the basis of his personal style.”