The U.S. Supreme Court on Tuesday appeared divided along ideological lines as it heard a bid by Texas to revive Republican-drawn electoral districts thrown out by a lower court for diluting the clout of black and Hispanic voters.

Some of the conservative justices seemed willing during arguments in the case to accept that the Republican-led Texas legislature acted in good faith when it adopted new electoral maps in 2013 for state legislative and U.S. congressional seats.

Liberal justices seemed skeptical that those maps resolved racial discrimination concerns that caused earlier maps to be invalidated, and questioned whether it was premature to hear the case because a lower court had not yet issued a final ruling on the dispute.