U.S. immigration officials may not have even interviewed Tashfeen Malik, the woman who joined her husband in gunning down 14 people in San Bernardino, Calif., last week, before they allowed her to enter the country.

"We only interview people in the K-1 visa program where there is some issue that needs to be explored," Leon Rodriguez, director of U.S. Citizenship and Immigration Services, told the House Judiciary immigration subcommittee Wednesday.

The agency gave Malik a K-1 visa, also known as a finance visa, allowing her to leave Saudi Arabia and enter the U.S. to marry Syed Farook.

Shortly after Malik swore allegiance to the Islamic State on Facebook, the heavily-armed couple slaughtered 14 of Farook's coworkers and wounded 21 more. They died in a shootout with police.

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