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 seeking to throw out 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 of 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 issues 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.