President Donald Trump’s pattern of selective endorsements for 2026 Republican primaries continues to shape trader expectations, with his backing favoring candidates aligned with his policy priorities and past loyalty. In recent weeks he issued endorsements across dozens of Texas congressional and state legislative races ahead of primary runoffs, while signaling an imminent decision in the high-profile U.S. Senate contest between incumbent John Cornyn and challenger Ken Paxton. Trump has endorsed the large majority of Senate Republicans seeking re-election but withheld support from a handful of incumbents with prior disagreements. Traders are watching for any announcement before the Texas runoff’s early voting begins, as well as further endorsements in competitive House and gubernatorial primaries where his influence has historically boosted primary turnout and fundraising for aligned candidates.