Wisconsin Sen. Ron Johnson says too many questions about possible military action in Syria remain for him to support it right now.
Johnson voted in committee Wednesday against authorizing limited use of U.S. armed forces against Syria. The Senate Foreign Relations Committee, however, approved the resolution in a 10-7 vote.
The Republican said in a statement that the vote was taken only 25 hours after formal hearings began and so many questions remained that he "could not even consider voting 'yes.'"
Johnson says President Barack Obama must show why military action in Syria is in the U.S.'s national security interest. He says he will keep an open mind until he casts his final vote.
A vote in the full Senate could come next week.