With five months remaining before the 2026 midterm elections, former President Donald Trump continues to exert substantial influence over Republican primary races, maintaining an impressive 98% success rate in endorsing winning candidates this year. According to an analysis of 312 GOP primaries, Trump-backed contenders have prevailed across congressional, statewide, and state legislative contests nationwide, reaffirming his dominant position within the Republican Party despite waning national popularity.

Trump highlighted this record following the June 23 primaries, a day that saw his endorsed candidates secure victories in over a dozen Republican contests, including the upset win of Anthony Constantino, a first-time candidate from upstate New York who defeated Assembly member Robert Smullen by approximately 20 percentage points. Trump contrasted his success with that of New York City Mayor Zohran Mamdani’s preferred Democratic candidates, who also swept three congressional primaries on the same date.

However, scrutiny of these victories reveals complexities. In several races, Trump’s endorsements were directed at incumbents running unopposed, such as Representative Mike Lawler of New York. Additionally, in South Carolina’s Republican gubernatorial runoff, Trump notably endorsed both candidates, allowing him to sidestep a direct loss.

Trump’s endorsements have significantly reshaped the GOP landscape by sidelining longstanding conservative lawmakers who have challenged his influence. Senators Bill Cassidy of Louisiana, John Cornyn of Texas, and Representative Thomas Massie of Kentucky were among prominent incumbents defeated after conflicts with Trump. His campaign also targeted Indiana state legislators opposing his stance on congressional map redistricting, successfully unseating five of seven dissenters.

Political analysts note that Trump’s proactive approach to intraparty contests is unprecedented, with previous presidents generally avoiding direct involvement. Unlike President Joe Biden’s limited engagement in the 2022 primaries, Trump has consistently and assertively influenced Republican nominations. Mark P. Jones, a political science professor at Rice University, emphasized the difficulty for candidates to succeed against Trump-backed opponents, highlighting the extent of his sway throughout federal and state races.

Trump’s involvement extends even to down-ballot contests. In Texas, he endorsed Attorney General Ken Paxton over Senator Cornyn and backed former state Senator Don Huffines as a “MAGA warrior” for state comptroller, a race Huffines won decisively despite longstanding opposition to Governor Greg Abbott from some conservative circles.

The timing and tactics of Trump’s endorsements have evolved since his first term. Unlike 2018, when endorsements occurred about seven weeks before primaries, this year’s endorsements often arrive several months in advance, sometimes in uncontested districts, helping clear paths for his preferred candidates. In certain instances, such as in Kentucky, Trump has exerted influence through executive channels, urging rivals to withdraw in exchange for administration roles, thereby consolidating support for his chosen candidates.

While Trump’s firm grip on the party base has consolidated loyalty, it also raises concerns about its broader electoral impact. His insistence on allegiance may alienate moderate Republicans in competitive districts or swing states who previously distanced themselves from him to bolster their general election prospects. Polls reflect this division: approximately 80% of Republicans approve of Trump’s performance, contrasting sharply with low approval among Democrats and independents.

The Republican National Committee is preparing to hold its first-ever midterm convention this summer in Dallas, where Trump is expected to speak, further signaling his central role in shaping the party’s agenda. Allies argue that his leadership aligns closely with the priorities of most GOP voters.

On the other hand, Democrats view Trump’s influence as a strategic vulnerability they can exploit. Democratic Governors Association Chair Andy Beshear accused Trump-endorsed Republicans of loyalty to a leader whose policies have adversely affected American families. In key battleground states like Nevada and Ohio, Democratic candidates have leveraged ties between GOP incumbents and Trump to appeal to moderate and independent voters.

Despite his dominance, Trump has faced setbacks. Iowa Republican voters narrowly rejected his pick, Representative Randy Feenstra, in favor of Zach Lahn in the gubernatorial primary. Similarly, Trump-backed Lieutenant Governor Burt Jones lost the Georgia gubernatorial nomination to Rick Jackson, though Trump later praised Jackson for running a “TRUMP” campaign.

As midterm contests approach, Republicans appear compelled to closely align with Trump’s agenda to secure primary victories, even as the general election environment challenges the popularity of his brand. Conservative advocacy groups suggest this dynamic shapes not only party unity but also the broader strategic orientation of GOP campaigns in 2026.