Tensions flared Monday as Washington strained to respond to the worsening COVID-19 outbreak, with Congress arguing over a nearly $2 trillion economic rescue package and an impatient President Donald Trump musing openly about letting the 15-day shutdown expire.

As the U.S. braces for an onslaught of sick Americans, and millions are forced indoors to avert a spike that risks overwhelming hospitals, the most ambitious federal intervention in modern times is testing whether Washington can swiftly halt the pandemic on the home-front.

By evening, it appeared there would be no further votes Monday, and talks would push into the night.

“It’s time to get with the program, time to pass historic relief,” said an angry Senate Majority Leader Mitch McConnell as he opened the chamber after a nonstop weekend session that failed to produce a deal. “This is a national emergency.”

Fuming, McConnell warned Democrats — pointedly House Speaker Nancy Pelosi — to quit stalling on “political games,” as he described Democratic efforts to steer more of the aid toward public health and workers.

Trump, who has largely been hands-off from the negotiations, weighed in late Monday from the White House briefing room, declaring that Congress should vote “for the Senate bill as written," dismissing any Democratic proposal.

“It must go quickly," Trump said. “This is not the time for political agendas."

The president also sounded a note of frustration about the unprecedented modern-day effort to halt the virus's march by essentially shutting down public activities in ways that now threaten the U.S. economy.

Even though Trump's administration recommended Americans curtail activities starting a week ago, the president said: “We cannot let the cure be worse than the problem itself. At the end of the 15-day period, we will make a decision as to which way we want to go.”

Trump said that he may soon allow parts of the nation's economy, in regions less badly hit by the virus, to begin reopening, contradicting the advice of medical and public health experts across the country, if not the globe, to hunker down even more firmly.

The White House team led by Treasury Secretary Steven Mnuchin worked on Capitol Hill for a fourth straight day of talks as negotiators narrowed on a bipartisan accord.

With a wary population watching and waiting, Washington laboured under the size and scope of a rescue package — larger than the 2008 bank bailout and 2009 recovery act combined.

Democrats are holding out as they argue the package is tilted toward corporations and should do more to help suddenly jobless workers and health care providers with dire needs.

But Republicans complained Democrats were holding out for more labour protections for workers, wanting assurances that corporations taking federal aid will commit to retaining their employees. -- AP