Updated at 4:52 p.m. ET

They began Saturday as a series of pop-up demonstrations outside several major airports. But by Sunday, the protests against President Trump’s temporary immigration freeze had leapt from those airports to squares and plazas in cities across the U.S.

Outside the White House, in Boston’s Copley Square and Battery Park in New York City, immigrant advocacy groups have organized protests to register their discontent with the executive order Trump signed Friday.

That order bars all refugees from entering the U.S. for 120 days, as well as citizens of seven largely Muslim countries for 90 days. The freeze also applies to green card holders, who are legal U.S. residents; they will need a case-by-case waiver to enter the country.

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“Protecting this nation and our people is the No. 1 priority of this president and our government,” White House press secretary Sean Spicer said Sunday, arguing that the immigration ban is the best way to do that.

Groups of protesters across the country disagree with that assessment — so much so that they make their objections readily evident with signs and chants, rallies and marches in at least a half-dozen different cities.

With the help of NPR and member station reporters on the ground, here are some postcards from Sunday’s major protests.

Boston

“A lot of people say they had a visceral reaction when they heard the news either Friday or Saturday,” says Jack Lepiarz of member station WBUR.

Jack is reporting from Boston’s Copley Square, but the same could be said of groups of protesters in

Reporting from Boston’s Copley Square, Jack tells NPR’s Lulu Garcia-Navarro that the plaza, which is roughly the size of a football field, has been packed with protesters of the executive order.

“They say there need to be more protests like this,” Jack says, referring to conversations he had with demonstrators there. “It’s almost a show of force, as one woman said, where you get the bodies out there and tell the people in office that this is not OK.”

Washington, D.C.

Meanwhile, outside the White House, the crowd of protesters rippled with the chant “no hate, no fear, refugees are welcome here,” according to NPR’s Parth Shah.

NPR’s Parth Shah reports the crowd has rippled with the chant “no hate, no fear, refugees are welcome here.”

“I did not think it would be me; I thought it would be refugees,” American University student Lames al-Kebsi, a protester in D.C., tells NPR’s Wynne Davis. “Because I am here as a guest, I am here a visitor. I am not a threat to the country. It was really a shock … I didn’t expect it to be students, as well.”

Kebsi, who is from Yemen, says that Saturday night she told her parents that under the order, she cannot see them for the next two years — because if she leaves the country, she will not be able to return to finish her degree at American.

Others, like D.C. resident and middle school teacher Trisha Sanghavi, echoed the sentiment heard by Jack in Boston.

“This is what D.C. is going to look like every weekend now,” Sanghavi told NPR.

Chris Chester of WAMU reports that what began as a rally outside the White House has now transformed into a march toward the Capitol.

Los Angeles

Even as demonstrators have taken to the streets in several cities, protests continue to pack major international airports in the U.S.

The arrivals hall at Los Angeles International Airport filled not only with signs and loud chants — well before the protest’s scheduled start time — but also with a number of lawyers, NPR’s Kirk Siegler reports.

He notes attorneys scattered throughout the crowd holding signs of their own, only these signs are offering their free legal services for those who could use them.

And there may indeed be some who do. Some distressed family members are in the gathering too, Kirk reports. He says it is believed that there are still people detained behind the main gates.

Houston

By a quirk of coincidence, the protest in Houston was held outside the George R. Brown Convention Center — where festivities were well underway for next week’s Super Bowl in the city.

Laura Isensee of member station KUHF says it made for a surreal juxtaposition, as football fans in Houston Texans jerseys walked past chanting protesters with signs.

She reports that among the crowd were members of a nearby church, just out of a Sunday service, along with members of the Muslim community and Black Lives Matter activists. The protesters numbered more than 1,000, according to the Houston Police Department.

Cleveland

Outside the departures area of the city’s major airport, as well as inside by the ticketing counters, protesters packed into a peaceful demonstration, reports Kabir Bhatia of WKSU.

He says the mood of the crowd was almost joyful, as protesters chanted slogans and occasionally “parted the Red Sea” to allow travelers to enter the airport.

“I’m just so glad,” one girl, a Syrian immigrant, told the crowd with a megaphone. “It just blowed up my heart when I saw everyone’s here for the same reason I am.”

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