SACRAMENTO, Calif. -- As campaigning for Gov. Gavin Newsom's Proposition 50 ramps up, legal challenges are already emerging against his push for a voter-approved redraw of California's congressional districts.

The mid-decade redistricting aims to shore up at least five Democratic U.S. House seats in the midterms - an attempt to offset Texas Republicans' proposed gerrymander designed to keep Congress under GOP control.

On Monday, President Donald Trump threatened to sue California over his redistricting ballot measure.

"I think I'm going to be filing a lawsuit pretty soon, and I think we're going to be very successful," Trump said. "We're going to be filing it through the Department of Justice, that's going to happen."

California Republicans file complaint to remove Prop 50 from ball

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