New Jersey Democratic Sen. Cory Booker said the U.S. should be building tunnels, not walls when asked about his stance on immigration Monday.

Booker was asked if he would be willing to compromise with Republicans and put limits on immigration and fund the border wall.

“I think the wall is a dead end, and I think that people in New Jersey know. Why would we spend billions of dollars to build a wall that even southern states congress people and senators know wouldn’t do anything to really add security to this country?” Booker said to NJTV News. “In a time when we should be building bridges not walls, building tunnels in this region, not walls.”

Booker’s appearance was supposed to be about his announcement that he would be co-sponsoring Vermont Sen. Bernie Sanders’ single-payer health care bill. (RELATED: Booker Announces He Backs Single-Payer Healthcare Bill)

The plan is called “Medicare for All,” and would expand the federal health care program that covers those over 65 to all Americans.

Under a single-payer system, the federal government cover medical expenses, which Booker supports.

WATCH:

“You should not be punished because you are working-class or poor and be denied health care. I think health care should be a right to all,” said Booker. “This is something that’s got to happen. Obamacare was a first step in advancing this country, but I won’t rest until every American has a basic security that comes with having access to affordable health care.”

A June Pew poll found that 52 percent of Democrats and Americans who lean Democrat support federally-funded universal healthcare.

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