A push by Texas Republicans and President Donald Trump to redraw congressional maps to secure five more GOP seats in the U.S. House has sparked a no-holds-barred battle between blue and red states, each threatening to redraw their own House districts.

The process of changing congressional maps to try and ensure one party's victory over another — called gerrymandering — has typically been done more furtively, with parties fearing a backlash from voters wary of a rigged system.

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