A Republican state lawmaker on Wednesday unveiled a bill that would prohibit transgender students from using the bathroom of their choice in Michigan.

Senator Tom Casperson's bill would require schools to use “biological sex” to separate use of facilities such as bathrooms, locker rooms and showers.

While the proposal has been assigned to a committee, Senate Majority Leader Arlan Meekhof said that the issue was not a priority in his chamber.

The bill is a response to a May 13 letter from the Obama administration that advises schools to allow transgender students to use the bathroom of their choice.

On Wednesday, eleven states led by Texas filed a federal lawsuit challenging the guidelines.

(Related: Eleven states sue Obama administration over student transgender bathroom use.)

The issue has exploded nationwide since North Carolina in March became the first state to prohibit transgender people from using the bathroom of their choice in government buildings, including schools.