CHICAGO — On Friday afternoon, a group of suburban synagogue members clustered at O’Hare International Airport, waiting to greet one of the last Syrian refugee families to be accepted in the United States, to give them the warmest possible welcome to a country that no longer wanted their kind.

In Washington, the presidential limousine was already speeding toward the Pentagon, where President Trump would sign a paper officially slamming the door shut on Syrian refugees. But here the volunteers had yellow roses, more warm coats than the newcomers would need and, a few miles away, an apartment ready with a doormat that said “welcome” in 17 languages.

“Welcome to chicag Hope you make your selfs at home” said a sign made by one of the youngest members of the group.