He called the Brexit "a foreshadowing of what will likely happen in November."
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Google Trends reported the most-searched questions in the wake of the vote.
"Cameron's legacy will be breaking up two unions. Neither needed to happen."
British comedian holds up Trump speech at golf course in Scotland.
A majority of Scots voted in favor of remaining with the EU.
"We had to find a way to dramatize the issue; make it real, make it plain, make it simple."
Sanders also called for more international cooperation.
Trump slammed Obama for lobbying Britain to stay in the EU.
Cameron did not give an exact date, intends for a new leader to be in place by October.
Rep. Alan Grayson (D-Fla.) rebuked Ryan for criticizing the protest's motives.