Republicans and Democrats on the House Armed Services Committee say they are launching an unusual bipartisan campaign to push back against President Donald Trump’s proposed withdrawal of all U.S. forces from Syria.

Texas Republican Mac Thornberry, the committee’s chairman, and Washington Democrat Adam Smith, the ranking member and likely the new chairman in the next Congress, said in separate interviews Thursday that they will join forces to try to slow or shape, if not stop, the president’s move. It was their first public comments on the issue.

Similar bipartisan alarms have rung in the Senate Armed Services Committee.

The House Armed Services campaign may begin with a rare joint statement by Thornberry and Smith, which they expect to release later Thursday. It may also include efforts to support the president’s top advisers as they attempt to set the terms on how the withdrawal plays out, the senior lawmakers said.

In the interviews, Thornberry and Smith previewed their statement and expressed unequivocal criticism of the president’s move.