At a time of historically high political violence in the U.S., a substantial number of Americans doubt the legitimacy of recent attempts against President Trump's life. Trump has been the subject of three assassination attempts over the last two years, however, a NewsGuard/YouGov poll released Monday finds that 30% of Americans think at least one of those incidents was staged. The findings come just weeks after a gunman allegedly attempted to storm the White House Correspondents' Dinner, where Trump was in attendance, but was stopped at a security checkpoint by law enforcement before reaching the main ballroom. In the weeks...