WASHINGTON, June 14 - Democrat Hillary Clinton won the District of Columbia primary on Tuesday, CNN projected on Twitter, capturing the party’s last presidential nominating contest as Democrats turn their focus to the Nov. 8 election against presumptive Republican nominee Donald Trump.

Clinton, who secured enough delegates to clinch the Democratic presidential nomination last week, will meet in private later on Tuesday with rival Bernie Sanders as the sometimes bitter political combatants search for common ground in the race against Trump.

We just won Washington, D.C.! Grateful to everyone who voted.pic.twitter.com/ImPsK42yGd

— Hillary Clinton (@HillaryClinton) June 15, 2016

Sanders is under pressure to give up his campaign and help unite the party. But the U.S. senator from Vermont has vowed to push on to next month’s convention to gain more converts to his agenda of reducing income inequality, curbing big money in politics and reining in Wall Street.

At a news conference in Washington on Tuesday, Sanders said he would also demand changes to make the Democratic nominating process more equitable, including replacing the Democratic National Committee leadership, letting independents take part in the voting and eliminating superdelegates, who are unelected and are free to support any candidate.

“The time is long overdue for a fundamental transformation of the Democratic Party,” Sanders told reporters.

Sanders had promised to stay in the Democratic race until the final vote was cast in the Washington, D.C., primary, although he has stopped talking about capturing the party’s nomination and instead focused on ways he can push his agenda.

He scheduled a national video address to supporters on Thursday night.

During a visit to Capitol Hill earlier on Tuesday, Sanders told Democratic senators he would take his message of progressive values and party reform to the convention.

“I’m open to that, I think we should all be open to that,” Senator Dick Durbin of Illinois told reporters afterward. “It’s not a surprise that the American people are skeptical of all of us in political life. And we ought to step back and reassess why, and what we can do about it.”

Top Democrats have taken steps in the last week to begin rallying behind Clinton and ease Sanders out of the race without alienating his supporters.

President Barack Obama endorsed Clinton on Thursday, hours after meeting with Sanders at the White House. Sanders also went to Capitol Hill to meet with Senator Harry Reid, the top Democrat in the Senate. Reid said afterward that Sanders had accepted Clinton as the Democratic nominee.

Clinton has also secured the endorsement of Senator Elizabeth Warren of Massachusetts, the leader of the party’s left wing who remained neutral in the primary race until it was clear Clinton would be the nominee. Warren’s populist credentials will boost Clinton’s ability to court Sanders’ voters.