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 still withholding an endorsement from 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, saying Friday he doesn't know if anything will come of the talks between the two campaigns.

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"Right now, to be very frank with you, we are talking to the Clinton campaign to try to determine whether or not they can come up with some very serious proposals which will help us transform America," Sanders said to supporters at a rally in Albany, N.Y. "Whether it will happen or not — that's a good question. I don't know. We are working with them right now."

The two campaigns have been in discussions since Clinton became the party's presumptive nominee earlier this month. The Sanders camp has pressured Clinton to support a $15 per hour minimum wage and tuition-free college.

Ignoring calls to suspend his presidential bid, he has launched a series of "Where We Go From Here" speeches but has laid off the Clinton attacks frequent during the primaries.

Instead, he encouraged his supporters to fight against the Democratic establishment and rally for a more progressive party.

"What we are trying to do also is to come up with the most progressive platform that the Democrats have ever had," Sanders said Friday. "And a platform is a piece of paper. That is what it is. It doesn't mean anything. But what we have got to do is demand and make certain ... that platform becomes part of the Democratic Congress' agenda."

While Sanders has not yet endorsed Clinton, he said Friday morning he planned to vote for her for president to keep presumptive Republican nominee 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 out of the White House.