Watch: Trump Crowd Erupts... "Lock Her Up!"

After the FBI reopened its investigation into Hillary Clinton’s use of a private server while secretary of state on Friday, Donald Trump supporters who turned out for a rally in New Hampshire erupted into "Lock Her Up!" chant just as Trump took the stage.  

FBI Director James Comey wrote in a letter to top members of Congress Friday that the bureau has “learned of the existence of emails that appear to be pertinent to the investigation.”