President Trump has repeatedly declined to endorse Vice President JD Vance for the 2028 Republican presidential nomination, most recently during a May 12 Rose Garden event where he polled attendees on a potential Vance-Rubio ticket, described it as a "dream team," and explicitly stated that neither has his endorsement "under any circumstance." Similar comments in February 2026 emphasized that it remains too early for such a commitment, consistent with Trump's pattern of delaying successor announcements until closer to primary season. These developments reinforce trader consensus around an 81.5% implied probability for no endorsement before 2027, as the president maintains flexibility amid an open field and Vance focuses on administration duties rather than early campaigning.