US Congress members in Cuba talks
State television showed Mr Castro talking to members of the delegation, which is in Havana to explore ways of improving US-Cuban relations.
Barack Obama is expected to ease some of the travel and economic restrictions imposed on Cuba nearly 50 years ago.
Barbara Lee, the leader of the seven-strong group of Democrats, said the group did not carry a message from President Barack Obama but had come only to "listen and talk" with the Cubans.
Last week, a bipartisan group of US senators introduced a bill that would allow all US citizens to travel freely to Cuba for the first time since 1962.
Democratic Senator Byron Dorgan said the policy had "failed for 50 years", adding that he believed it would win enough votes in the US Congress to pass.
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