Several current and former law enforcement officials said an Obama-era investigation found some evidence that Ms. Omar had entered into a sham marriage with a man suspected of being her brother.

© Tierney L. Cross/The New York Times

The judge ruled that no immediate action was necessary, dealing another setback to the administration as it moves to target voting by noncitizens.

© Mike Blake/Reuters

As Trump officials stump for Republican candidates facing difficult races, ethics experts say they are being lax about complying with the Hatch Act, a federal anti-corruption law.

© Doug Mills/The New York Times