NPR''s Legal Affairs Correspondent Nina Totenberg reports that the Senate soon may vote on whether or not to call witnesses in the impeachment trial of President Clinton. Members also are expected to vote on a motion to dismiss all charges. Last night, the Senate met to consider the motions in a closed-door session. House Judiciary Chairman Henry Hyde says dismissing impeachment charges would be a sign of disrespect to the House. The Senate is expected to vote on the motions today or Wednesday.