Bernie Sanders will be working with presumptive nominee Hillary Clinton to defeat Donald Trump.

Sanders has urged his supporters to look beyond the Democratic presidential nomination in a speech that stopped short of fully endorsing Hillary, but made clear he was no longer actively challenging her candidacy. In an anti-climatic speech for the effective end of a 14-month campaign adventure, the Vermont senator insisted his “political revolution continues” despite Clinton’s effective victory in the delegate race. Now, he is turning his attention to making sure Trump won’t win the general election.

“The major political task that we face in the next five months is to make certain that Donald Trump is defeated and defeated badly,” Sanders told supporters in a live-stream video. “And I personally intend to begin my role in that process in a very short period of time.”

“Election days come and go but political and social revolutions that attempt to transform our society never end,” he said. “Let me conclude by once again thanking everyone who has helped in this campaign in one way or another. We have begun the long and arduous process of transforming America, a fight that will continue tomorrow, next week, next year and into the future.”