Rep. Mark Green (R-Tenn.) introduced a constitutional amendment Thursday that would limit the number of Supreme Court seats to nine, as several Democratic presidential candidates express a willingness to consider expanding the number of justices on the bench.

“The temptation to create a Court of super-legislators must be resisted,” Green said in a statement. “Limiting the number of seats to the nine we have currently would help ensure the U.S. Supreme Court remain an impartial branch beholden to the Constitution and no political party.”

Green’s proposal, which he first announced on Tuesday, is in response to Democratic presidential contenders floating the idea of boosting the Supreme Court’s capacity to combat what they say are Republican efforts to politicize the judicial system.

Sens. Elizabeth Warren (D-Mass.) and Kamala Harris (D-Calif.) have said expanding the Supreme Court should be part of a larger conversation, while Sen. Kirsten Gillibrand (D-N.Y.) told “Pod Save America” that the idea was “interesting,” but that she would “need to think more about it.”