Sen. Mitt Romney (R-UT) confirmed Thursday that he will not mount a primary challenge to President Donald Trump, stating that the president will be the Republican presidential nominee and likely win re-election in 2020. Romney, a frequent critic of President Trump, made the remarks while hosting a roundtable discussion on anti-vaping policy at Intermountain Primary Children’s Hospital in Salt Lake City, Utah. Three Republican challengers have launched longshot primary bids against President Donald Trump — former Massachusetts Gov. Bill Weld, former Rep. Mark Sanford (R-SC), and former Rep. Joe Walsh (R-IL) — However, several GOP state parties have already canceled...