WASHINGTON — On Wednesday night, President Trump implored the nation’s political leadership to “stop the partisanship” and come together to confront the coronavirus pandemic. On Thursday morning, he woke up and immediately issued partisan attacks on Democratic congressional leaders.

Mr. Trump’s call for a suspension of partisanship lasted just nine hours, at least some of which he was presumably asleep. While some of Mr. Trump’s allies and advisers have urged him to stop fighting and assert more national leadership, the president made clear that it does not suit him.

The first of the president’s partisan jabs came before dawn on Thursday morning and had nothing to do with the coronavirus or anything that had happened in the last few days. Instead, he reached back to revive a controversy from a week ago when Senator Chuck Schumer of New York, the Democratic leader, harshly assailed two conservative Supreme Court justices over abortion rights.

Mr. Trump retweeted a March 4 message from Jonathan Turley, a law professor who opposed impeachment, condemning Mr. Schumer: “Schumer’s threat to the Court that ‘you will pay the price’ is a direct attack on the integrity of our courts. I criticized Trump for his reckless comments about the courts. Where is the chorus of condemnation of Schumer? Schumer sounded more like a stalker than a statesman.”