Presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE is projected to win the Washington, D.C., primary.

The victory will give Clinton a majority of Washington’s 20 pledged delegates and send her into next month’s convention on a high note.

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After a tough challenge by rival Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE, Clinton closed out the primary season winning four of the final six contests. She will finish with an advantage of nearly 400 pledged delegates over Sanders.

Clinton won’t have earned enough pledged delegates from the primaries and caucuses to secure the nomination outright — Democrats rarely do — but superdelegates will push her across the threshold at the convention in Philadelphia in July.

The only remaining question is when and how Sanders decides to exit the race.

Clinton and Sanders were scheduled to meet Tuesday evening, and he will speak to his supporters in a video address Thursday.

Many Democrats are hopeful he’ll drop out of the race out that point and begin the process of unifying his millions of supporters behind Clinton ahead of a general election match-up against Republican Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE.

Sanders is expected to try to push the Democratic platform in a more progressive direction at the convention.

He may also use leverage earned through the primaries to push through rules changes, such as the elimination of superdelegates.