Trump's endorsements carry substantial weight in Republican primaries for the 2026 midterms, reflecting trader focus on his pattern of backing candidates aligned with border security, tax cuts, energy dominance, and election integrity priorities. As of mid-August 2026, he has issued hundreds of endorsements with a near-perfect primary win rate exceeding 97 percent, often targeting open seats or challengers to incumbents in Senate and House races. Recent activity includes support for figures in Texas, Florida, Louisiana, and other states ahead of November voting. Upcoming primaries and runoffs through September and October could prompt further announcements, while his public schedule and statements on key battlegrounds remain the main catalysts for shifts in market-implied probabilities.