President Trump is pondering swift military action in Iran. There were similar expectations that the war in Iraq would be quick and triumphant.

© Doug Mills/The New York Times

For people in countries like Afghanistan and Myanmar, the president’s order dimmed hopes for sanctuary in the United States.

© Agence France-Presse — Getty Images

The travel ban revives an effort from President Trump’s first term that led to chaos and court battles.

© Hiroko Masuike/The New York Times

The travel ban revives an effort from President Trump’s first term that led to chaos and court battles.

© Hiroko Masuike/The New York Times