Bernie Sanders will join Hillary Clinton at a campaign event Tuesday in Portsmouth, New Hampshire, the presumptive Democratic nominee's campaign announced Monday morning.

Clinton's campaign said that the two Democratic candidates "will discuss their commitment to building an America that is stronger together and an economy that works for everyone, not just those at the top."

The 11 a.m. ET rally will be held at a local high school where the Vermont senator is expected to formally endorse Clinton after weeks of not giving her his full-throated endorsement after the primaries ended.

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CBS News's Major Garrett confirmed the news about a joint event last Thursday after the two campaigns were engaged in talks over what could be scheduled.

The Tuesday rally comes less than a week before the Republican National Convention in Cleveland and a few weeks before the Democratic National Convention in Philadelphia.

While he still hasn't officially dropped out of the presidential race, late last month, Sanders said that he will vote for Clinton in November's general election.

The rally will come after a long primary battle between Sanders and Clinton during which they each went after each other's policy positions and voting records. Sanders even questioned whether Clinton was qualified to be commander-in-chief at one point, although he quickly walked the statement back.

While Clinton endorsed then-Senator Obama just a few days after the end of the presidential primary cycle in 2008, Sanders has waited much longer since the primaries officially ended in mid-June to make a move.