The chief justice of Pennsylvania's Supreme Court is condemning moves to impeach most of the court's Democratic justices.

The impeachment resolutions, introduced by a Republican lawmaker, follow a tense battle over the commonwealth's redrawn congressional map, which the Democratic-majority court imposed after declaring the previous map unconstitutionally gerrymandered to favor Republicans.

Chief Justice Thomas Saylor, himself a Republican, said he was "very concerned" about the filings.

"Threats of impeachment directed against Justices because of their decision in a particular case are an attack upon an independent judiciary, which is an essential component of our constitutional plan of government," he wrote in a statement.

State Rep. Cris Dush is the lawmaker behind the impeachment push. He is specifically taking issue with the fact that after invalidating the map, the court called for it to be redrawn in time for the 2018 midterm elections.

Justices gave lawmakers three weeks to fix it but didn't provide their full opinion until two days before the deadline.

According to Dush, four of the court's five Democrats "stripped the people of the commonwealth of their sovereign right; they have stripped the legislature ... of their sovereign authority to write legislation, and they have absolutely no power or authority under the constitution to do so."

Dush has not introduced a resolution for the court's fifth Democrat, Max Baer, because Baer didn't want to redraw the congressional map so quickly even though the justice also thought the 2011 boundaries were unconstitutional.

House Republican spokesman Steve Miskin said there have been no discussions on the resolutions, but he noted that GOP leaders do believe the court acted improperly, even though the U.S. Supreme Court and another federal court let the ruling stand.

The justices' congressional map, released about a month ago, was drawn by Stanford professor Nathan Persily, who has contracted with a number of states to draw nonpartisan maps.

It is set to take effect for the May 15 primary election.

The new district lines are totally reshaped and renumbered, and they significantly improve Democrats' prospects. Under the 2011 map, Democrats won only five of Pennsylvania's 18 congressional seats three elections in a row — even though Donald Trump only narrowly won the state and Barack Obama won it twice.

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