President's son cranks up insulting rhetoric after bombs were mailed to his father's opponents.
Former Fox News host Kimberly Guilfoyle had been slated to join her boyfriend in Bozeman.
Matt Rosendale's ad talks about gun rights and the Constitution's Second Amendment while showing Article II, which deals with the executive branch.
Montana, which Trump won by 20 percentage points, will be one of 2018’s top Senate battlegrounds.
And here are four other races to watch on this primary day.