Vermont Senator Bernie Sanders to campaign along with Hillary Clinton in New Hampshire

Former US Secretary of State and New York Senator Hillary Clinton and Vermont Senator Bernie Sanders (file photo)

Vermont Senator Bernie Sanders is set to campaign along with his former rival, Democratic nominee Hillary Clinton, in the US state of New Hampshire in the run-up to 2016 presidential election.

The Clinton campaign made the announcement on Sunday as the former US secretary of state was preparing for the first national debate before the November 8 Election Day with her rival, GOP nominee Donald Trump.

Sanders will appear on the stage alongside Clinton at the University of New Hampshire Field House on Wednesday, two days after the first presidential debate, to talk about the issue of college affordability to American students.

"Hillary Clinton and Bernie Sanders will campaign together in New Hampshire to discuss their shared belief that cost should not be a barrier for anyone who chooses to go to college, and student debt should not hold Americans back after they leave school," the Clinton campaign said in a statement. "That includes enabling all students with family income up to $125,000 to attend an in-state public college or university tuition-free, covering more than 80 percent of all families."

On July 12, Clinton and Sanders joined forces at Portsmouth High School, where he endorsed her ahead of the Democratic National Convention.

That was the last time the two politicians appeared together in public.

Sanders had earlier managed to beat the former New York senator in the first-in-the-nation New Hampshire presidential primary by a landslide margin of 60 percent to 38 percent.

As a presidential candidate, the Vermont senator vowed to “fight to make sure that every American who studies hard in school can go to college regardless of how much money their parents make and without going deeply into debt.”