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.), who endorsed 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, is laying out what supporters hope for from presumptive Democratic 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.

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"They're looking for the big ideas that he advocated for in his campaign to be fully embraced, to be woven into the conversation at the convention," Merkley said on CNN's "New Day" Friday.

Merkley cited a number of issues, including pivoting away from fossil fuels, making college more affordable, creating more jobs and keeping money out of politics, that he believes Sanders supporters want to see addressed.

"These are the core pieces of the puzzle we hope can be fully articulated and that will be both great policy and great politics," said Merkley, the first senator to back Sanders's presidential campaign.

After wins in several primary states Tuesday, including California, Clinton became the party's presumptive nominee, accumulating enough pledged delegates and support from superdelegates to clinch the nomination. On Thursday, Clinton was also endorsed by President Obama.

But Sanders has insisted he will stay in the race until the convention in hopes superdelegates will flip their support, despite meeting with Obama on Thursday. He has also said he will allow every state to vote, with the last primary in Washington, D.C.'s on Tuesday.

Fellow Democrats and Sanders supporters like Merkley have suggested he should throw in the towel and work toward uniting the party ahead of the general election.

"Once a candidate has won a majority of the pledged delegates and a majority of the popular vote, which Secretary Clinton has now done, we have our nominee," Merkley said to The Washington Post Tuesday.

"This is the moment when we need to start bringing parts of the party together so they can go into the convention with locked arms and go out of the convention unified into the general election."