Fifty-seven senators, including 24 Republicans, have signed the letter.
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Of those who signed the letter, 57 are senators, including 24 Republicans.
Top Chinese political advisor meets Greek PM
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Top Chinese political advisor meets Yemeni president
Two black dogs playing in the snow.
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A black dog digs in the snow.
UN inspectors hail progress over Syria chemical weapons
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U.S. has not concluded Syria used chemical weapons -White House