The ads, part of an initial $1 million campaign which will begin to air on television and appear online on Wednesday, make the case that none of Mr. Trump's judicial appointments deserve bipartisan support because they are putting loyalty to the president above the Constitution.

The evidence that Demand Justice cites for that claim is that none of Mr. Trump's appointments to lifetime court seats have said in written answers to the Senate that Mr. Trump lost the 2020 election or that the attack on the Capitol on Jan. 6, 2021, amounted to an insurrection.

The three senators being targeted with the initial ad campaign are John Fetterman of Pennsylvania, Maggie Hassan of New Hampshire and Angus King of Maine, who is an independent but caucuses with Democrats. Notably, none of three are up for re-election in 2026. All are moderates and among the group who voted to end the government shutdown last month. . . .

Mr. Fetterman has voted to confirm one judge, Ms. Hassan has voted for three and Mr. King has voted for four, the group said.