Texas Sen. Ted Cruz said he learned that the Secret Service and U.S. Navy triggered a rash of collision alarms in planes around Reagan Airport on March 1 while testing anti-drone technology that used a similar frequency to the one used by planes' warning systems. Cruz said that happened despite a warning from the FAA against doing it.

The agency said it’s taking steps to lessen the risk of collisions, but lawmakers say too many gaps remain — and place part of the blame on the military.

Testifying for the first time in front of the Senate Subcommittee on Aviation, acting Federal Aviation Administrator Chris Rocheleau admitted that "something was missed."