Aug 2025 – Governor Greg Abbott signs a new Texas congressional map that adds five Republican‑leaning seats, fulfilling President Trump’s call for mid‑decade redistricting and setting the stage for a Supreme Court showdown [2].

Nov 4 2025 – California voters approve Proposition 50 with 64 % support, enacting a Democratic‑drawn congressional map designed to flip up to five GOP‑held House seats in the 2026 midterms [5].

Nov 13 2025 – The Trump administration files a lawsuit challenging California’s voter‑approved map, arguing it unlawfully manipulates district lines for partisan gain [5].

Dec 4 2025 – The U.S. Supreme Court issues an unsigned emergency order allowing Texas to use its newly redrawn map for the 2026 elections, overturning a lower‑court block that found the plan likely racially gerrymandered [2][7].

Dec 4 2025 – Justice Elena Kagan, writing for the three liberal justices, warns that the Court’s stay on the Texas map “violates the Constitution” by imposing race‑based districts that dilute minority voting power [14].

Dec 5 2025 – In a 6‑3 decision, the Supreme Court formally upholds the Texas map, clearing the way for five additional Republican seats and preserving the party’s narrow House majority [11].

Dec 11 2025 – The Indiana State Senate rejects a Republican‑backed congressional map that would have unseated the state’s two Democratic members, marking a rare intra‑party defeat for the Trump‑driven redistricting push [5].

Dec 14 2025 – Senator Rand Paul warns that the nationwide partisan redistricting battle “could heighten civil tension and even lead to violence,” emphasizing that both parties are complicit [10].

Dec 15‑16 2025 – A three‑judge federal panel in Los Angeles hears a restraining‑order request from the Justice Department and California Republicans, who claim the new California map uses race to favor Hispanic voters; the hearing occurs just before the Dec 19 filing deadline for 2026 candidates [18].

Jan 14 2026 – A federal three‑judge panel in Los Angeles rules 2‑1 to allow California to use its voter‑approved congressional map in future elections, rejecting Republican and DOJ attempts to block it and keeping the five‑seat Democratic advantage on track [4][17].

Feb 2 2026 – Democrat Taylor Rehmet defeats Republican Leigh Wambsganss by over 14 percentage points in Texas Senate District 9, flipping a seat Trump carried by 17 points in 2024 and signaling potential Democratic momentum despite the new GOP‑friendly map [9].

Feb 3 2026 – States across the nation accelerate mid‑decade redistricting: Texas finalizes its map adding five GOP seats; California proceeds with its Democratic‑leaning map; Missouri, North Carolina and Virginia adopt new maps that each add Republican seats, reflecting a bipartisan scramble for advantage ahead of the 2026 midterms [16].

Feb 4 2026 – The Supreme Court issues an unsigned order clearing California’s new congressional map, rejecting a last‑minute Republican and Trump administration challenge; the decision leaves in place the 64 % voter mandate to create five Democratic‑friendly districts [1][8][15][22].

Feb 4 2026 – Governor Gavin Newsom declares, “Trump started this redistricting war… he lost, and will lose again in November,” framing California’s map as retaliation against the Texas plan [1][22].

Feb 4 2026 – Attorney General Pam Bondi calls Newsom’s map “a brazen power grab” that relies on racial gerrymandering, intensifying the partisan clash over the new districts [1].

Feb 4 2026 – Justice Samuel Alito, in a concurrence, notes that both Texas and California adopt maps for “pure and simple” partisan advantage, underscoring the Court’s reluctance to intervene on partisan grounds [3][15].

Feb 4 2026 – Candidate filing for California’s 2026 congressional primaries opens on Feb 9, as the new map reshapes the state’s delegation from nine Republican seats toward a projected 43 Democratic, eight Republican, and one vacant seat configuration [8][22].