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's lone supporter in the Senate is flipping to back 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 for president.

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Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.), the only senator to endorse Sanders, on Friday told CNN he would back Clinton just days after she became the party's presumptive nominee.

"Certainly, I'm going to be supporting our nominee and our nominee is Secretary Clinton," Merkely told CNN.

He also said Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) would be a "wonderful vice presidential choice."

Merkley earlier this week urged Sanders to rethink his campaign and back Clinton to unify the party before the general election, but he hadn't yet formally endorsed her until Friday.

When Merkley endorsed Sanders in April, he said he was "boldly and fiercely addressing the biggest challenges facing our country."

Clinton has won a number of big victories this week. She became the presumptive nominee after winning the California primary and has taken a commanding lead with the party's superdelegates, and she's been endorsed by President Obama, Vice President Biden and Warren.

Sanders, who met with Obama at the White House on Thursday, is continuing his campaign, but has dramatically softened his rhetoric in recent days, leading onlookers to believe he no longer plans to try to contest the Democratic convention in July.