Twitter@realDonaldTrump President Donald Trump slammed Sen. Mitt Romney (R-UT) as a “Democrat secret asset” who attempted to “infiltrate” his administration as secretary of state following the 2016 election in a video shared to Twitter Friday evening. REPUBLICANS MUST STICK TOGETHER AND FIGHT! pic.twitter.com/chnSNURfFx — Donald J. Trump (@realDonaldTrump) October 18, 2019 In the one-minute video,…