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Florida Sen. Marco Rubio, whose parents left Cuba in 1956, is spending Tuesday at the U.S. Naval Base at Guantanamo Bay, Yahoo News has learned. The trip is his first to Cuba. Rubio, a member of the Senate Select Committee on Intelligence, plans to spend one day at the base to learn more about U.S. operations there, Rubio spokesman Alex Conant said. Rubio is not planning to leave the property, which the U.S. government leases from the island nation. [Related: Florida Dems ding Rubio with a song] A prison on the base is home to hundreds of foreign detainees the U.S. government has labeled "enemy combatants," many of them captured in Afghanistan since al-Qaida's attack on New York and the Pentagon in 2001. At Intelligence Committee hearings, Rubio has expressed concern about the activities of the detainees once they are released from the prison, and in 2011, he co-sponsored legislation that would ensure that the prison remains open. [Related: ...