WASHINGTON - Republicans and Democrats in Congress pushed the Obama administration on Tuesday to immediately require background checks of social media for all foreigners seeking U.S. visas - a move they say might have helped foil the San Bernardino attack.

Tashfeen Malik, who the FBI says carried out the attack with her husband, came to the United States on a K-1, or fiance, visa.

Malik's radicalization and her apparent online discussions about jihad have raised concerns about how she was able to pass a background check that the government has described as rigorous.