He added, “We will have more to say in the very near future.”

Mr. Sanders is expected to endorse Mrs. Clinton on Tuesday morning at a campaign event in Portsmouth, N.H., according to several Democrats who are familiar with the planning. When asked if he would campaign with her on Tuesday, Mr. Sanders did not answer directly.

“We look forward to continue working with the Clinton campaign,” he said, “and we’ll have more to say as to where we go forward in the near future.”

Although the trade fight was heated in Orlando, with impassioned speeches from Sanders allies like Ben Jealous, a former leader of the N.A.A.C.P., and Nina Turner, a former state senator from Ohio, aides to Mr. Sanders were relatively conciliatory afterward. His policy director, Warren Gunnels, said that the Sanders team was “very disappointed” in the outcome and still denounced the “disastrous trade deal,” but that it also sought to look forward.

“The good news is that virtually everyone who spoke during the debate on trade made it clear that they opposed this unfettered free trade agreement,” Mr. Gunnels said in a statement. “Senator Sanders, Secretary Clinton and the overwhelming majority of Democrats agree: The T.P.P. should not come up for a vote after the election. If Democrats are going to prevail in November, we must make clear to the American people that we stand firmly against the T.P.P.”

Advocates of the trade deal are hoping that Congress will ratify it during a lame-duck session after the November election — the scenario that Mr. Sanders and his allies wanted the Democrats to go on record as opposing in the platform. Mrs. Clinton, who once supported the trade deal but reversed herself during the nomination contest with Mr. Sanders, has signaled that she opposes a lame-duck vote, telling a group opposing the partnership, “I have said I oppose the T.P.P. agreement — and that means before and after the election.”

Sanders allies will now weigh whether to undertake a platform battle over the trade deal at the convention in Philadelphia in two weeks. Many in the party’s left wing want such a fight and are skeptical of Mrs. Clinton’s resolve against free trade deals, since she has supported some in the past and her husband, former President Bill Clinton, pushed for the ratification of the North American Free Trade Agreement.

But given Mrs. Clinton’s need to unite the party, and Mr. Sanders’s desire to defeat the presumptive Republican nominee, Donald J. Trump, Mr. Sanders may ultimately choose not to mount a distracting and divisive war on the convention floor over trade.