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Vermont Sen. Bernie Sanders holds a press conference at the National Press Club in Washington, D.C., on Sunday. | Getty Sanders: 'It will be a contested convention'

Bernie Sanders predicted Sunday that Hillary Clinton would not win enough pledged delegates to claim the nomination ahead of the Democratic convention in Philadelphia, and he delivered his most forceful call yet for superdelegates in states he's won to consider throwing their support to him.

Speaking at the National Press Club in Washington, D.C., the Vermont senator argued that Clinton "will need superdelegates to take her over the top at the convention in Philadelphia. In other words, it will be a contested convention."

Sanders said that in the states where he handily defeated Clinton, superdelegates who aren't supporting him should reconsider aligning themselves with the will of voters of those states.

"In the state of Washington, we won that caucus with almost 73 percent of the vote there — 73 percent of the vote. In anybody's opinion, that is a massive landslide. But at this point Secretary Clinton has 10 superdelegates from the state of Washington, we have zero," Sanders said, offering an example of a state where he won the popular vote but did not collect any superdelegates. "I would ask the superdelegates from the state of Washington to respect the wishes from the people in their state and the votes they have cast."

Sanders' comments came just ahead of Tuesday’s Indiana primary, as his path to the nomination has become even more narrow due to recent defeats. The campaign recently laid off a large number of staff members in states that have voted.

Clinton currently has 1,645 delegates and 520 superdelegates, while Sanders has 1,318 delegates and 39 superdelegates. In total, 2,383 delegates are needed to win the Democratic nomination.

Sanders conceded that it wouldn't be easy for him to close the margin, but he said he would continue fighting.

"For us to win the majority of pledged delegates, we need to win 710 out of the remaining 1083," Sanders said. "That is 65 percent. That is, admittedly, a tough road to climb, but not an impossible one. And we intend to fight for every vote and delegate remaining."