The development marks a rapid progression for a statewide ballot measure, which are often years in the making.

Gov. Gavin Newsom and Texas Democrats jointly promoted California’s plan to redraw congressional lines and offset a redistricting scheme in Texas. The proposed map is expected to be made public next week.

As a Texas senator summoned the F.B.I. to round up Democrats, the redistricting war that began in Texas was spreading, with California aiming at five Republican House seats.