The maneuvering put the destiny of Congress’ aid package deal again unsure at a essential juncture, as coronavirus circumstances surge, unemployment insurance coverage claims stay excessive, and a spate of weakening knowledge factors underline that American households and companies are contending with near-term financial ache whilst vaccines stoke hopes for a future rebound. With out renewed authorities help, hundreds of thousands could possibly be staring down a bleak pandemic winter with little assist at their disposal.

The language Mr. Toomey and different Republicans are pushing for would rescind funding earmarked to help Fed credit score for small and medium-sized companies, state and native governments and massive companies. Extra alarming to Democrats, it could additionally bar the Fed and Treasury Division from restarting new variations of essential mortgage packages enacted this yr.

That might take off the desk a great tool for Mr. Biden as he takes workplace amid a unbroken financial stoop — and it angered Democrats, who had blasted Steven Mnuchin, the Treasury secretary, for his choice final month to shut the Fed packages on the finish of the yr.

Mr. Toomey denied that he was making an attempt to harm the incoming Biden administration or tank the economic system. However he conceded that his measure was supposed to stop Democrats from profiting from the Fed’s emergency mortgage packages as a option to get low cost credit score to favored debtors. The packages had been meant to maintain markets from breaking down, Mr. Toomey argued, to not assist municipalities or drawback oil and fuel firms relative to green-energy rivals.

“It will be a horrible concept to morph these packages into one thing else,” Mr. Toomey stated in a name with reporters. Beneath some Democrat’s plans, he warned, “the Fed wouldn’t be the lender of final resort, it could be the lender of first resort.”

Mr. Toomey, who stated the brand new language is “a very powerful factor” to him, stated it was additionally broadly supported by Senate Republicans and by Mr. Mnuchin. A senior administration official confirmed that the Treasury secretary supported it.

Democrats condemned the transfer, which would depart the Biden administration with even fewer instruments to combat the financial mess it would inherit.

“This can be a vital last-minute request from Senate Republicans that goes nicely past something they’ve requested for prior to now,” stated Bharat Ramamurti, a Democratic member of the congressional oversight fee tasked with overseeing the Fed’s packages. It will “radically restrict the power of the Biden administration and the Fed” to offer credit score and help markets subsequent yr, he stated.

Reporting was contributed by Zolan Kanno-Youngs from Washington and Nicholas Fandos from New York.