“Let’s be clear. This historic moment, Democrats sided with the American people and every single Republican in Congress sided with the special interests,” Biden said. “Every single Republican, every single one, voted against tackling the climate crisis, against lowering our energy costs, against creating good paying jobs for Americans. That’s the choice we face.”

Biden and Democrats desperately need the law, and a spate of other legislative wins, to help boost their poll numbers and improve their chances of protecting congressional majorities they are in danger of losing to Republicans in the fall.

Biden’s approval rating stands at just 40 per cent, while 55 per cent of Americans disapprove of the job he is doing, according to FiveThirtyEight’s polling analysis.

US climate bill focuses on breaking Chinese supply chain for electric cars

The president and cabinet officials are planning more than three dozen events in 23 states during the coming weeks to highlight the new law, according to a memo from the White House. Biden also plans to hold a celebration in Washington on September 6 once lawmakers return from August recess.

Biden’s signature caps off a tumultuous effort that began last year when Democrats took control of Congress and the White House to approve new social and economic programmes that the president promised during his 2020 campaign.

The push was derailed in December when centrist Democratic Senator Joe Manchin of West Virginia pulled out of negotiations over a broader proposal called “Build Back Better” that contained more elements of Biden’s agenda.

It was later revived after Manchin negotiated a breakthrough deal in late July on a smaller package with Senate Majority Leader Chuck Schumer. They overcame a last-minute snag from moderate Democratic Senator Kyrsten Sinema of Arizona on tax provisions.

The roughly US$437 billion bill would cap and lower the price of medicines for seniors in part by letting Medicare negotiate drug prices for the first time, a long-sought goal for Democrats.

It contains US$374 billion in energy and climate provisions, including tax credits for electric vehicles and incentives for clean-energy projects, in what the White House says is the largest-ever single investment to address climate change.

“This bill is the biggest step forward on climate, ever,” said Biden, “and is going to allow us to boldly take additional steps toward all my climate goals.”

It would also extend subsidies for Obamacare premiums for three years, inject US$80 billion into the Internal Revenue Services’ budget, impose a 15 per cent minimum tax on large corporations and a 1 per cent excise tax on stock buy-backs.

But to win over Manchin, Democratic leaders had to give up on some of the party’s more ambitious goals, such as paid family and medical leave for workers nationwide, free pre-kindergarten education and an extension of the child tax credit.

They also included new support for fossil-fuel projects in the law. Democrats dropped a tax provision that would have targeted wealthy fund managers after Sinema objected.