A special session is the first step of what could be a months-long race to change Virginia’s congressional map before next year’s midterms. The nationwide effort spreads to Indiana.

A major political battle is unfolding in Virginia as Democrats in control of the General Assembly open a special session to redraw the state’s congressional districts—a move Republicans call a blatant power grab.

Virginia and Indiana were poised on Monday to become the latest battlegrounds in a rare and widening mid-decade redistricting war instigated by President Donald Trump.

A joint resolution from the Virginia House of Delegates outlines the Virginia Democrats’ plan for redrawing congressional maps ahead of next year’s mid-term elections.