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Sia and Bleachers frontman Jack Antonoff have vowed to match fans’ donations to the American Civil Liberties Union (ACLU) in light of President Donald Trump’s immigration ban.

“Help our queer & immigrant friends,” the “Chandelier” singer tweeted. “Send me your donation receipts for the @aclu & I will match up to $100K.” Antonoff promised to match “up to 20k” and asked his Twitter followers to tweet him “donation receipts.”

Trump’s executive order, which was signed on Friday, blocks immigrants from several “majority-Muslim countries” from entering the U.S. Following immediate public outcry and protests across the country, the ACLU filed a lawsuit to stop the action, leading a federal judge from New York to temporarily bar deportations.

Rosie O’Donnell promised to match Sia’s $100,000 donation, while writer-filmmaker Judd Apatow tweeted, “We are all going to join you. I am in!”

The CW showrunner Julie Plec (The Vampire Diaries, The Originals) also tweeted that she would give the ACLU a dollar for each time that post was retweeted.

Elsewhere, Canadian musician Grimes tweeted she would “match all donations to CAIR [Council of America-Islamic Relations] up to $10,000.” Just about three hours later, she posted a tweet confirming her payment of $10,000 to CAIR. “Thank you so much to everybody who donated,” she wrote. “It means a lot<3”

Speaking out against Trump at the Producers Guild of America Awards on Saturday, singer-actor John Legend said he and wife Chrissy Teigen also made donations to the ACLU. “There’s a lot of money and power in this room and I hope you all will use it for something good,” he said. “Let’s all continue to stand up together for what is right.”