As Neil Gorsuch faces a grilling in the Senate Judiciary Committee later Tuesday, liberal groups mobilizing against him are accelerating the pressure against Democratic senators with a new digital ad campaign urging them to filibuster the Supreme Court nominee.

The People’s Defense, a coalition of more than a dozen progressive organizations, is launching the six-figure digital ad campaign on Tuesday. An example of one ad, aimed at Sen. Bob Casey (D-Pa.), calls President Donald Trump’s first Supreme Court nominee “unfit” for the vacancy and urges people to flood Casey’s office with phone calls against Gorsuch’s nomination.