There was perhaps no clearer illustration of the terrible choice facing Senate Democrats than the massive crowd of protesters who gathered Tuesday night in front of the Brooklyn home of Senate Minority Leader Chuck Schumer. While Donald Trump was busy announcing his nomination of Neil Gorsuch to fill the late Antonin Scalia’s seat on the Supreme Court, hundreds demonstrated outside Schumer’s door, demanding that the Democratic Party oppose the president’s agenda—Gorsuch’s nomination included.

Whether to stonewall Gorsuch remains a matter of debate within Democratic circles, with some worried that if Schumer and his colleagues filibuster Trump’s pick, Republicans could deploy the so-called “nuclear option” to eliminate the use of the parliamentary procedure against Supreme Court nominees, depriving the party of a critical weapon in any future court fights. But as the widespread opposition to Gorsuch voiced Tuesday night by Democratic senators makes clear, the party may be choosing war sooner rather than later.

Senators Ed Markey and Ron Wyden both said outright that they would not vote for Gorsuch, while senators Elizabeth Warren, Bernie Sanders, and Al Franken all publicly criticized his record. “I was hopeful that the president would have selected someone like Merrick Garland, a consensus candidate lauded by the same Republicans who ultimately refused to hold a hearing on him for nearly a year,” said a displeased Franken in a statement. Even before Trump named Gorsuch as his nominee, Jeff Merkley signaled that he would filibuster the president’s pick, announcing that he would do “everything in my power” to prevent the seat from being filled.

Schumer himself tweeted his opposition, though he did not fully commit to a filibuster:

To some progressives, however, these statements did not go far enough. “Senate Dems, let's be very clear: You will filibuster & block this SC nom or we will find a true progressive and primary u in next election,” documentary filmmaker and liberal firebrand Michael Moore tweeted on Tuesday night, echoing an increasingly popular sentiment on the left. MoveOn.org and Democracy for America have both promised to oppose any senators who support Gorsuch’s nomination.

“As long as the president is in flagrant disregard for the basic underpinnings of our republic, it is no time to consider a Supreme Court nominee,” Ben Wikler, the Washington director of MoveOn.org, told Vox in an interview. Murshed Zaheed, who leads the progressive group CREDO, was even more direct, warning of a “massive revolt” if Democratic leaders don’t stand firm: “If any of them vote for Trump’s Supreme Court nominee, we're going to mark them down as collaborators.”