Timothy Parsons, a legal staffer at the U.S. Attorney's Office in Washington, D.C., is facing federal criminal charges in Maryland, where he lives, three sources said.
The measure, which would block President Trump from further military force against Iran, appears poised to fall short of the simple majority needed to advance in the Senate.
Rep. Christian Menefee, who was first elected earlier this year in a special election, is running against longtime Rep. Al Green, who had been gerrymandered into the same district.