After winning the West Virginia primary Tuesday, Sen. Bernie Sanders (I-VT) told supporters at an Oregon rally he’d continue fighting to defeat Hillary Clinton—who is well ahead of Sanders in the delegate count—for the Democratic nomination.

“Let me be as clear as I can be, we are in this campaign to win the Democratic nomination,” Sanders said, pointing to upcoming primaries in Oregon, Kentucky, and California.

“Now we fully acknowledge, we are good at arithmetic, that we have an uphill climb ahead of us,” Sanders said. “But we are used to fighting uphill climbs. We are have been fighting uphill from the first day of this campaign, when people considered us a fringe candidacy.”

His speech hit his main platform proposals—economic inequality, universal health care, making public universities free—before Sanders turned his fire on Donald Trump, the presumptive GOP nominee.

“While we have many disagreements with Secretary Clinton, there is one where we agree and that is we must defeat Donald Trump,” Sanders said. “And I am very happy to tell you we will defeat Donald Trump.”

Sanders pointed to polls that showed him besting Trump both nationally and on a state-by-state basis. He also said that his campaign was “generating the energy and the enthusiasm” that would bring a big turnout in November and secure a Democratic victory. He praised the younger voters who have propelled his campaign.

“Our vision is the future of America and the future of the Democratic primary,” Sanders said.

“Mr. Trump will not become president because the American people understand that our strength is in our diversity,” he added.