NEW YORK, Sept. 1 (UPI) — Vermont Sen. Bernie Sanders will hit the campaign trail in support of Hillary Clinton for the first time since endorsing her prior to the Democratic National Convention.

Sanders will rally voters in neighboring New Hampshire on Labor Day, the Clinton campaign said. He will focus on his own campaign’s main theme, economic inequality.

“Sanders will discuss Hillary Clinton’s plan to building an economy that works for everyone, not just those at the top, and Donald Trump’s plan, which would benefit himself and other millionaires and billionaires,” the Clinton campaign said Thursday.

The timing of Sanders’ re-emergence on the campaign trail is notable, as well. Labor Day honors the U.S. workforce and Sanders maintained close ties with organized labor during his primary campaign by calling for a national $15-per-hour minimum wage.

Labor Day also marks the unofficial end of summer and start of the campaign’s final phase, with little more than two months remaining before Election Day on Nov. 8.

Campaigns typically begin their full court press for votes in key swing states after Labor Day, with the candidates, their running mates and top surrogates fanning out across the country to rally supporters and persuade voters who are still on the fence to come to their side. It is also when candidates and the numerous outside groups supporting them empty their war chests to blanket the airwaves and the Internet with advertising and begin implementing get-out-the-vote operations they hope will drive up turnout.

Since endorsing Clinton and playing a largely deferential role at the DNC, Sanders has not had a high public profile, instead focusing on launching a new political organization, Our Revolution, meant to build on his success in the primary.

The Clinton campaign did not say how frequently Sanders will appear in support of Clinton as the election draws near, but Sanders said in his endorsement of her that he is willing to do whatever is necessary to help defeat Donald Trump.