WASHINGTON (AP) — Democratic presidential nominee Joe Biden hammered President Donald Trump and leading Senate Republicans for trying to rush a replacement for the late Justice Ruth Bader Ginsburg, as pressure mounted on senators to support or oppose a quick vote to fill the seat.

As the Senate returned to Washington on Monday, all eyes were on Republicans Mitt Romney of Utah and Chuck Grassley of Iowa for clues to whether Trump and Majority Leader Mitch McConnell will be able to confirm Ginsburg’s replacement anytime soon. A day earlier, Biden had urged unnamed Republicans to join Sens. Lisa Murkowski of Alaska and Susan Collins of Maine in opposing a confirmation vote before the Nov. 3 election. It takes four GOP senators breaking ranks to keep Trump’s nominee off the court.

“Uphold your constitutional duty, your conscience,” said Biden, speaking in Philadelphia on Sunday. “Let the people speak. Cool the flames that have engulfed our country.”

Jamming the nomination through, Biden said, would amount to an “abuse of power.”

It was the latest round of ferocious maneuvering that has followed Ginsburg’s death at 87 on Friday. Her passing upended a campaign that had, until then, focused on Trump’s handling of the coronavirus pandemic, the nation’s economic collapse and racial unrest that has stoked protests across U.S. cities.

Trump has said he intends within days to name a woman to succeed the liberal icon, McConnell was moving ahead swiftly with plans for confirmation hearings and votes.

Despite Biden’s urging, there was little chance of calm overtaking the historic campaign as early voting progressed and the death toll from the virus neared 200,000 Americans.

Just before Murkowski joined Collins, House Speaker Nancy Pelosi referred to the House having “options” she did not name to stall or prevent the Senate from confirming Ginsburg’s successor to the lifetime job.

“We have arrows in our quiver that I’m not about to discuss right now,” Pelosi said Sunday on ABC’s “This Week.” The House has no formal role in the confirmation of Supreme Court justices. But Pelosi would not rule out a new round of impeachment proceedings that might divert the Senate’s attention.

Meanwhile, Murkowski raised by one the number of Republicans opposing a rush to confirmation.

“For weeks, I have stated that I would not support taking up” a potential nomination as the presidential election neared. “Sadly,” she said, “what was then a hypothetical is now our reality, but my position has not changed.”

Republicans hold a 53-47 edge in the Senate. If there were a 50-50 tie, it could be broken by Vice President Mike Pence.

There is another potential wrinkle: Because Arizona’s Senate race is a special election, that seat could be filled as early as Nov. 30. If Democrat Mark Kelly wins and is seated, that would narrow the window for McConnell.

Trump has said he is obligated to act as soon as possible and had at least two women in mind for the seat. Most Republicans concurred on the need for speed and one named a practical reason: The nine-member court, argued Sen. Ted Cruz of Texas, must be full if called upon to decide the outcome of a disputed presidential election.

But Biden and other Democrats said voters should choose the next president, who should, in turn, pick Ginsburg’s successor. Health care, abortion rights and religious freedom are on the line, they said.

Biden, who has run on uniting the country after Trump’s divisive tenure, warned against more upheaval.

“The last thing we need is a constitutional crisis that plunges us deeper into the abyss and deeper into the darkness,” he said. He acknowledged that if Trump wins, his pick should be approved.

But Biden added, “If I win this election, President Trump’s nominee should be withdrawn and as the new president I should be the one to nominate Justice Ginsburg’s successor.”

Nonetheless, the process for replacing her moved swiftly ahead. On a call with McConnell, R-Ky., late Saturday, Trump mentioned two federal appeals court judges: Amy Coney Barrett and Barbara Lagoa, according to a person familiar with the private conversation who was not authorized to publicly discuss the call and spoke on condition of anonymity.

To the chants of “Fill that seat,” Trump told supporters at an event Saturday night in North Carolina that he would nominate a woman as soon as this week.

“We win an election and those are the consequences,” said Trump, who then seemed to signal that he’d be willing to accept a vote on his nominee during the lame-duck period after the election. “We have a lot of time. We have plenty of time. We’re talking about January 20th” — when the next president is inaugurated.

Democrats have denounced McConnell’s move to push ahead as hypocritical, pointing out that he refused to call hearings for President Barack Obama’s nominee, Merrick Garland, 237 days before the 2016 election.

If the court were to take cases with eight justices, 4-4 ties would revert the decision to a lower court; for instance, the Affordable Care Act could then be struck down by a lower Texas court.