The former president suggested that Democrats opposing G.O.P. efforts in Texas and elsewhere should advance their own gerrymandering plans.

Former President Barack Obama has waded into states’ efforts at rare mid-decade redistricting efforts, saying he agrees with California Gov. Gavin Newsom’s response to alter his state’s congressional maps, in the way of Texas redistricting efforts promoted by President Donald Trump aimed at shoring up Republicans’ position in next year’s elections.