PHILADELPHIA — Joe Biden on Sunday used the sudden Supreme Court vacancy to reinforce his argument that the upcoming election should be a referendum on President Donald Trump’s handling of health care and the coronavirus.

The death of Justice Ruth Bader Ginsburg jolted the presidential campaign just six weeks before the election and as several states are already voting. Trump has seized on the opportunity to nominate a new justice to motivate his most loyal voters. Biden kept the focus on health care, which has proven to be a winning issue for Democrats during previous elections and could be even more resonant amid the pandemic.

The Supreme Court will hear a Republican-led case challenging the Affordable Care Act, which the Trump administration supports, the week after the Nov. 3 election. Biden charged that Trump is seeking to undermine the protections for people with pre-existing conditions under the ACA, as well as its provisions covering preventative care for women.

“Millions Americans are voting because they know their health care hangs in the balance,” Biden said during remarks at Constitution Center in Philadelphia. “In the middle of the worst global health crisis in living memory, Donald Trump is before the Supreme Court, trying to strip health care coverage away from tens of millions of families.”

The Supreme Court could also hear cases on a few more particularly salient issue in the next few months: voting rights, and potentially who wins the November election.

Biden is expected to focus in the weeks ahead on the Democratic fight to prevent a nominee from being confirmed to the court, with a particular emphasis on the effect the court could have on health care and climate change. Biden aides stopped short of ruling out the possibility the campaign would advertise around the court fight, though that decision hadn’t been finalized.

Trump is promising to put forth a nominee this coming week and Senate Majority Leader Mitch McConnell, R-Ky., has vowed to call a vote.

“In a raw political move, this president and the Republican leader have decided to jam a lifetime appointment to the Supreme Court through the United States Senate,” Biden said. “That’s the last thing we need at this moment.”

Biden is still not, however, planning to release a list of potential Supreme Court nominees, because putting out a full list, the aide said, would further the court and the nomination process, aides said. Biden’s aides said those interested in his thinking on a justice can look to his long history as chairman of the Senate Judiciary Committee for guidance.

Their refusal to put names to Biden’s potential court pick underscores the political peril that the Supreme Court debate holds for Biden. Conservatives are still energized by the issue, and putting out names could offer Trump and his allies a list of conservative boogeymen to use against Biden to rev up his base.

Trump himself, at a rally Saturday night, basked in chants of “fill that seat” from the audience, and has pledged to move quickly on the nomination, whom he says is likely to be a woman.