WASHINGTON (AP) — Senate lawmakers are going to be questioning the nation's international-aid agency about a secret, U.S.-backed social media network built to stir unrest in Cuba.

On Tuesday, U.S. Agency for International Development Administrator Rajiv Shah begins a series of appearances before congressional panels starting with one led by Democratic Sen. Patrick Leahy of Vermont, who publicly called the social media program — quote — "dumb, dumb, dumb."

Lawmakers will try to determine whether the program should have been classified as "covert" under U.S. national security law, which requires covert action to be authorized by the president and briefed to congressional intelligence committees.