Protesters have gathered at airports in New York, Washington D.C., Chicago, Dallas and other cities as immigration authorities begin to block entry to all refugees and immigrants from seven Muslim-majority nations.

Thousands of protesters gathered Saturday at JFK International Airport. The New York Taxi Workers Alliance joined the protest by calling on its members not to pick up passengers between 6 and 7 p.m. tonight.

The American Civil Liberties Union and other legal organizations filed an emergency lawsuit Saturday on behalf of plaintiffs who have been detained and threatened with deportation even though they have valid visas to enter the United States.

“President Trump’s war on equality is already taking a terrible human toll,” said Omar Jadwat, director of the ACLU’s Immigrants’ Rights Project. “This ban cannot be allowed to continue.”

“Families are being ripped apart without warning and with no assurance of when they will be reunited,” said the National Iranian American Council in a statement. “Students traveling abroad at the time of the ban are horrified that they might not be able to return to continue their studies. Children are being detained along with their parents when they were just seeking to return home. This is a dark day in the history of this country.”

JFK airport #MuslimBan #NoMuslimBan #NoMuslimBanJFK #NoBanNoWall pic.twitter.com/Z2iwNdXPM1

— MoveOn.org (@MoveOn) January 28, 2017

Thousands protesting #MuslimBan right now at Chicago O'Hare Terminal 5 pic.twitter.com/3fQyT1dcy5

— Ali Abunimah (@AliAbunimah) January 29, 2017

Protest against Trump's Muslim ban at Logan airport #NoBanNoWall pic.twitter.com/2iMrEbMYzQ

— Amy Littlefield (@amylittlefield) January 29, 2017

Two hours into #SFO #MuslimBan protest, energy still high. pic.twitter.com/H6nRX2ddKQ

— Vivian Ho (@VivianHo) January 29, 2017

The crowd outside JFK Terminal 4 has grown ENORMOUS pic.twitter.com/RAUMX9EBhg

— Noah Hurowitz (@NoahHurowitz) January 28, 2017

Thousands of protesters at JFK, chanting “Let them in!” and “No hate no fear refugees are welcome here!” #MuslimBan pic.twitter.com/9SDiunzJDq

— Robert Mackey (@RobertMackey) January 28, 2017

Many are asking “How Can I Be of Help?” in the wake of the #MuslimBan.
Below are some ACTION STEPS. pic.twitter.com/h0NN4li90x

— Khaled Beydoun (@KhaledBeydoun) January 28, 2017