Sen. Dianne FeinsteinDianne FeinsteinDemocrats exploring lawsuit against Trump Overnight Finance: Dems explore lawsuit against Trump | Full-court press for Trump tax plan | Clock ticks down to spending deadline Comey to testify before Senate Judiciary Committee MORE (D-Calif.) said Sunday that the U.S. visa waiver program poses a threat to national security by making it easier for terrorists to enter the United States.
"[Terrorists] could come back from training, they go to a visa waiver country and they could come into this country."
The California Democrat was responding to the attacks in Paris last week in which Muslim extremists targeted satirical newspaper Charlie Hebdo and a Jewish deli. Seventeen people died.
Critics have said France was lax in tracking the three men behind the attacks, all of whom were killed last week. Feinstein replied that it's "difficult to ferret someone out" as they travel country to country.
"There are stolen travel documents in large numbers," she said. "They could pick up a false passport. … We have a big problem there."
Defenders of the U.S. visa waiver program said it has heightened U.S. security by increasing intelligence sharing between countries.