First up in the questioning of administrator Rajiv Shah is Sen Patrick Leahy, D-Vt, who publicly called the social media programme "dumb, dumb, dumb."
Last week, an Associated Press investigation revealed that USAID oversaw the creation of the text message-based service, dubbed ZunZuneo for the sound made by a Cuban hummingbird. USAID and its contractors went to extensive lengths to conceal Washington's ties to the project, according to interviews and documents obtained by the AP.
He was imprisoned there after traveling repeatedly on a separate, clandestine USAID mission to expand Cuban Internet access using sensitive technology that only governments use.
Early Tuesday, Gross' lawyer released a statement that his client was going on a hunger strike. The ZunZuneo story was "one of the factors" Gross took into account in connection with his hunger strike, the attorney said.
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Lawmakers will also try to determine whether the program should have been classified as "covert" under US national security law, which requires covert action to be authorized by the president and briefed to congressional intelligence committees.
Shah said last week that the ZunZuneo programme was not covert, though "parts of it were done discreetly" to protect the people involved.
He said on MSNBC that a study by the Government Accountability Office into democracy promotion programs run by USAID and the State Department, including the Cuban Twitter project, found the programmes to be consistent with the law.
But the author of the GAO study, David Gootnick, told the AP this week that investigators did not examine the question of whether the programmes were covert.