The order barred US border agents from removing anyone who arrived in the USA with a valid visa from Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen.
Trump's comments came as seven refugees bound for the United States were stopped from boarding a plane in Cairo on Saturday and 12 migrants were detained in NY overnight because they arrived just after the executive order was signed, prompting a massive protest and a cab strike.
The group has raised over $10 million since Saturday and has now gotten over 150,000 new members.
Lawyers and advocates working at the airport say they didn't have a hard count on the number of people taken into custody after getting off their flights. That will enable them to do a lot more to fight Donald Trump's agenda, which is already necessitating unprecedented emergency legal challenges.
ACLU's national director, Faiz Shakir, added that the ACLU is determined to win this legal battle. "I hope Trump enjoys losing", said Shakir.
"He's going to lose so much we're going to get sick and exhausted of his losing".
Perhaps due to their legal success, or because of widespread moral outrage, the ACLU has received almost 290,000 online donations for a total of $19.4 million this weekend alone, according to USA Today. The ban has caused widespread anger worldwide, with protests happening across the world in response. The ACLU claims that the detainment of those with permanent residence and valid visas "violates..." Over the year, the group has racked up some $24,164,691 coming from over 350,000 people, many of whom have never previously donated.
Families, students, engineers and doctors from across the Middle East who have made the United States their home on Saturday found themselves potentially uprooting established lives, after President Donald Trump this week curtailed immigration from seven Muslim-majority countries. "This is not a Muslim ban, as the media is falsely reporting".
The United States' Syrian refugee program accepted more than 12,000 Syrians into the United States previous year.
It also covered anyone with an approved refugee application. "They don't just want to write a check and be done with it".
The ACLU also has plans to defend reproductive rights, including Planned Parenthood, and to defend First Amendment, LGBT rights and other "core civil rights and civil liberties".