Nicole Gaudiano

USA TODAY

Sen. Bernie Sanders is about to start tearing up the campaign trail.

The Vermont independent will campaign for Hillary Clinton in the battleground states of Iowa and Minnesota on Monday and Tuesday, and appearances elsewhere are in the works.

“He’s talking about traveling all over the country to help Secretary Clinton," Sanders spokesman Michael Briggs said Friday, adding that Sanders also will help other candidates and discuss ballot issues he cares about.

Sanders spent most of August writing a book but has since campaigned for Clinton in Ohio (once) and New Hampshire (twice). An event Wednesday in the Granite State was the first joint appearance for Sanders and Clinton since he endorsed her in July. The event aimed to win more support for Clinton from millennials who supported Sanders in the primaries. Clinton is underperforming among young adults, a significant percentage of whom have turned to third-party candidates.

Briggs said Sanders hopes to reach a broad audience, including young people, working families and people involved in the labor movement. His message will be similar to what he said in New Hampshire: People need to get out and vote for Clinton because either she or Donald Trump will be president and the stakes are too high to vote for a third-party candidate.

“The choice is clear because of her position on issues Americans care about, from health care to college costs to jobs to the environment,” Briggs said.

On Monday, Sanders said his campaign schedule will be “very, very vigorous.”

“We’re going to go wherever Secretary Clinton’s people think that I am needed,” he said on MSNBC. “And I am going to work as hard as I can to make sure that Donald Trump does not become the next president.”

In both Iowa and Minnesota, Sanders will discuss Clinton’s plan “to build 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,” according to the campaign.