WASHINGTON (CBSNewYork/AP) — Hillary Clinton’s campaign is making it official: Former Democratic rival Bernie Sanders will join her at a New Hampshire event on Tuesday where he plans to endorse her.

Clinton’s campaign is holding the event at a high school in Portsmouth, New Hampshire. Sanders defeated Clinton by a wide margin in New Hampshire, in the nation’s first primary.

COMPLETE CAMPAIGN 2016 COVERAGE

Sanders’ endorsement will come a month after the final primary. He’s pushed for policy agreements on higher education, health care and a $15 an hour federal minimum wage. Some of those policies were included in a draft of the party’s platform in Orlando, Florida, over the weekend.

Sanders has not yet said he will endorse Clinton but told reporters on Saturday that the two campaigns were coming together and to stay tuned.

And while he still hasn’t officially dropped out of the presidential race, late last month he said that he will vote for Clinton in the general election.

(TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)