“This is Trumpism at the lower level,” said Bernard Grofman, an elections expert at the University of California, Irvine who redrew Virginia’s congressional map in 2015 following a federal court finding that districts had been racially gerrymandered. “This is the view that if independent branches of government say things that don’t match what you say or do, you fire them; you impeach them; you malign them; you destroy them as best you can.”