Nicole Gaudiano

USA TODAY

Bernie Sanders is likely to endorse Hillary Clinton on Tuesday, according to The New York Times and National Public Radio.

The Times and NPR cited anonymous Democratic sources familiar with discussions between the campaigns.

Sanders spokesman Michael Briggs would not confirm reports of a scheduled endorsement, telling USA TODAY: “We are continuing to have conversations with Secretary Clinton’s campaign and look forward to reaching a result that everybody’s happy with. Sen. Sanders has been on record that one of the issues that he and Secretary Clinton were interested in exploring further was how to make health care available to more Americans.”

The Vermont senator hinted at a possible endorsement on MSNBC’s All In with Chris Hayes on Wednesday night, saying his campaign worked with Clinton’s on a higher education proposal she released earlier that day and that they are still working on other ideas.

“And I think at the end of the day, there is going to be a coming together and we’re going to go forward together and not only defeat (presumptive GOP nominee Donald) Trump but defeat him badly,” Sanders said.

Hayes asked, “You’re not denying the report that there are talks about a possible endorsement?”

“That’s correct,” Sanders said.

Bernie Sanders applauds Hillary Clinton's education plan

Clinton's campaign announced Thursday that she will return to New Hampshire on Tuesday "to discuss her commitment to building an America that is stronger together and an economy that works for everyone, not just those at the top." The campaign says additional details will be released soon.

The AP on Wednesday said the Clinton and Sanders camps were discussing an endorsement event in the Granite State, the site of Sanders' first primary win.

In 2008, Clinton and then-senator Barack Obama held their first large joint rally in Unity, N.H., after Clinton conceded her bid for the Democratic nomination.

Sanders has said he will vote for Clinton and that he will work to defeat Trump. But he has withheld his endorsement while pushing for policy concessions from the Clinton campaign and in the Democratic Party platform. His representatives will seek more progressive stances on trade, the minimum wage and climate change this weekend when the party Platform Committee meets in Orlando, beginning Friday.

But Sanders issued a strong statement of approval of Clinton’s expanded education proposal, including new measures to eliminate college tuition for working families and reduce debt.

“This is a revolutionary breakthrough in the funding of higher education if we can pass it — and I look forward to seeing it passed — and what it really will mean is that higher education will be open to every person in this country regardless of his or her income,” he told USA TODAY.

Some Democrats have grown weary of Sanders’ apparent reluctance to back Clinton, and a group reportedly booed him during a closed session with the House Democratic caucus Wednesday morning after he wouldn’t answer questions about when he would endorse her.

Sanders told Hayes there were “a few people booing,” but most were “sympathetic.”

“What I say to those people who booed, you can boo me all you want,” he said. “I’m going to continue to fight to make sure that we transform this country. That’s what our campaign was about. That’s what 13 million voters wanted to see happen.”