President Donald Trump’s push to bolster the GOP’s narrow congressional majority in next year’s elections has prompted a rare nationwide mid-decade redistricting battle that has rapidly taken shape over the past weeks.

Indiana GOP lawmakers’ White House visit this week highlights how the race to redraw congressional districts for partisan advantage may soon expand beyond Texas and California — two states that have reached new stages in their dueling redistricting efforts. Missouri could also be on its way to redrawing its map to favor Republicans.

“Drawing districts to put your thumb on the scale is almost as old as the country,” said David Niven, a political science professor at the University of Cincinnati who conducts research on gerrymandering, elections and voting rights.

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