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MIAMI (CBSMiami) —  The Democrats are now rallying around their presumptive nominee Hillary Clinton but Bernie Sanders isn’t dropping out just yet.

Before exiting, he wants assurances that Clinton and the party won’t turn their backs on his progressive agenda.

Sanders met with President Obama in the White House Thursday morning.

“Let me begin by thanking President Obama,” said Sanders.

The two talked about how to move forward on the issues Sanders has fought for throughout his campaign.

“A handful of billionaires exercise enormous power over our political, economic and media life,” said Sanders.

Obama told Sanders his plans to endorse Clinton – something he did just hours after the meeting. The president was likely pushing the Vermont Senator to help Clinton unite the party in order to take on Donald Trump in the general election.

Related: President Obama Endorses Hillary Clinton In Video

Democrats acknowledge they need the millions of Sanders supporters to win the general election.

In an interview with CBS’ Scott Pelley, Clinton said one of her immediate goals is to expand her base of support.

“By reaching out to Senator Sanders supporters, to many others across this country, including, I hope, Republicans and Independents,” said Clinton.

Nearly one in five Sanders supporters say they will either vote for Trump or not vote at all.

Trump has meetings with big money donors to talk about a fundraising plan for the election.

Through the end of April, Clinton has outraised Trump by more than 150 million dollars.

But Trump says he doesn’t need to raise as much money because he gets so much free TV time in the media.

As for Sanders, he is still campaigning for now.  He has a rally planned in Washington, D.C. Thursday night. Democrats in the District go to the polls on Tuesday and are the last to vote in the nominating process.

Click here to read more about Campaign 2016.