The head of the TSA, who was in Brussels during last month's bombings, is giving Congress an update on U.S. airport security.

FOX's Jared Halpern is on Capitol Hill:

Security is being beefed up at U.S. airports ahead of the busy summer season.

TSA administrator Peter Neffenger tells lawmakers:

(Neffenger) "The expected volume means there will be longer waits during peak periods and travelers need to be prepared."

Neffenger says passengers will notice more agents in public areas, but the TSA is also taking unseen steps to reduce insider threats:

(Neffenger) "Oversight of the caterers, the catering facilities, the way in which they inspect catering carts, oversight of cargo, the way cargo is inspected."

Airports are also reducing access points for employees and Neffenger is supporting plans to increase continuous background checks.

On Capitol Hill, Jared Halpern, FOX News.