The House and Senate failure to agree on a continuing resolution resulted in a government shutdown that took effect at midnight on Tuesday.

Thousands of federal workers have been furloughed. Feinstein said 72 percent of the civilian intelligence workforce has been furloughed because of the shutdown. She said those workers analyze data in order to avert terrorist threats.

“What we are doing now is putting lives at risk,” Feinstein said. “What we have done damages our national security directly.”

It's unclear where the fight will go from here, with both sides digging in during the first government shutdown since 1996.