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Pennsylvania Republicans are inching toward a constitutional crisis.

A growing number of GOP officials in the Keystone State are calling for the impeachment of five justices on the Pennsylvania Supreme Court who struck down the state’s congressional districts for unconstitutional partisan gerrymandering. Those calls intensified after the court issued a new map on Monday that reduces Republicans’ advantage in races for the U.S. House of Representatives. The U.S. Supreme Court declined to intervene in the case last week.

State Representative Cris Dush began circulating a letter among colleagues calling for the Pennsylvania judge’s removal shortly after their decision. U.S. Representative Ryan Costello, who represents the state’s Sixth Congressional District, endorsed removing the justices for what he described as a “politically corrupt process.” Other Republicans are planning a lawsuit in federal court, which has the backing of President Donald Trump.

U.S. Senator Pat Toomey told reporters on Wednesday that impeachment is “a conversation that has to happen” among state lawmakers. “I think state house members, state senators, are going to be speaking among themselves and their constituents, and the fundamental question is, does this blatant, unconstitutional, partisan power grab that undermines our electoral process—does that rise to the level of impeachment?” he asked.

Pennsylvania Supreme Court justices are elected to ten-year terms, and can be reelected for another ten-year term. All five of the justices in the gerrymandering majority ran as Democrats. Pennsylvania’s House of Representatives holds the power to impeach judges, whom the state Senate could then vote to remove by a two-thirds vote. Both chambers are controlled by Republicans, while Governor Tom Wolf is a Democrat.

Impeaching judges for misconduct isn’t unheard of at the state level or in the lower federal courts. But Pennsylvania’s Republican lawmakers are proposing something much different. Removing judges purely on the basis of an adverse legal decision would be a grave breach of the principle of judicial independence, which helps form the bedrock of the American rule of law.