Senators are moving to block the administration from using federal money to build a border wall.
The House is expected to approve its own measure to block Trump from spending funds on a border border wall this week.
But Republican senators are using a procedural tool that gives them the power to block funding to build the wall if it would be used against a fellow Republican.
“The Senate is moving to pass a bill to stop the President from using funds from the American taxpayers for the construction of a wall along the U.S.-Mexico border,” Senate Majority Leader Mitch McConnell (R-Ky.) said in a statement.
The Senate Appropriations Committee will consider the bill on Tuesday.
The resolution is not likely to pass the full Senate.
But it will be a critical piece of the GOP’s legislation to help fund the government.
Trump has already asked Congress to send him a $1.6 billion request to build 1,000 miles of the border wall to keep illegal immigrants out of the country.
The administration says it needs $8 billion for the project.
The White House said the request will not be a prerequisite to funding the border-wall effort, but it will require the president to show that the wall will make it harder for people to enter the United States illegally.
Trump will have to certify to Congress that the border will not become a major transit point for people fleeing violence in Central America and that it will not have a major impact on crime in the border states.