"They will rue the day" they repeal Obama's health care law, Senate Democrats' leader-in-waiting told The Associated Press in an interview in his office on Friday. "It's a political nightmare for them. They'll be like the dog that caught the bus."
Trump, after meeting with Obama, said he'd like to keep popular pieces of the six-year-old law, including the requirement to extend coverage to people with pre-existing conditions and the provision allowing young adults to stay on their parents' health plans until age 26.
But Schumer said it was a non-starter to try picking off favored pieces of the Affordable Care Act.
"There is no way that you can keep those things without keeping the ACA," Schumer insisted. He added that he'd made similar points directly to Trump, but declined to share the president-elect's response.
Congressional Republicans have tried repeatedly to repeal the law that helped some 20 million Americans gain coverage, but they've been unable to coalesce around a replacement.
Democrats chose Schumer this week to serve as minority leader, replacing Sen. Harry Reid of Nevada, who is retiring after five terms. In the interview, Schumer also served notice on the Dodd-Frank Wall Street reform bill that provided for tougher oversight of financial institutions and created a consumer protection bureau after the 2008 economic crisis.
"He should not even try to think about repealing Dodd-Frank," Schumer said. "We will have enough votes to beat that back."
As leader of a 48-member Senate Democratic Caucus next year, Schumer will command enough votes to block majority Republicans from getting the 60 votes needed to proceed on most major legislation. As such, Schumer and his Democrats will be the only backstop against Trump and the GOP next year when Republicans control both chambers of Congress and the White House.
But the Brooklyn-born Schumer pledged to work with fellow New Yorker Trump when possible, arguing that to do otherwise would amount to a "a dereliction of our responsibility to the millions of Americans who need work, who need protection."
Indeed Schumer argued that on some issues Trump has more in common with the Democrats than Republicans, suggesting a strategy that would amount to forming alliances with Trump where possible against the wishes of conservative Republicans and GOP leaders on the Hill.
"Donald Trump in his campaign advocated many things or a good number of economic issues that Democrats support and Republicans have opposed," Schumer said, pointing to trade, spending on infrastructure, and a financial loophole benefiting wealthy Wall Street interests.
Schumer blamed Democrats' election failures on an ineffective economic message, and adopting some of Trump's rhetoric he pledged "a bolder, stronger, sharper-edged economic plan aimed at the middle class and those trying to be middle class, and an understanding that the system is rigged against the average person and it's gotta change, a draining of the swamp if you will."
But he also promised to fight Trump "with everything we've got" when the new president takes an approach opposed to Democratic values. "We're not going to do something in name only," Schumer said.
On infrastructure, Trump has proposed a $1 trillion spending program that some conservatives are already balking at.
Schumer said he'd told Trump: "It'll make a lot of your hard-right people against it, the Freedom Caucus will never go for a large infrastructure bill."
"He didn't say 'no,'" Schumer said of Trump's response.
And unlike demands from conservatives, Schumer said he didn't think such an infrastructure bill would have to be fully paid for — meaning it could add to the deficit instead — a position he said he believed Trump might share.
Schumer also signaled a fight over the Supreme Court vacancy, noting that after refusing to act for nearly a full year on Obama's nominee, Merrick Garland, for the vacancy created by the death of Justice Antonin Scalia, "our Republican colleagues who want to move this quickly don't come before us with clean hands."
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