As MAGA frustration with old guard Republicans reaches a fever pitch, Senate Republicans are poised to face the single largest turnover in their recent history come January, due to a combination of death, retirements and President Donald Trump’s getting involved.

Republicans currently have 53 seats in the upper chamber, but are essentially guaranteed to see at least eight in their ranks not return for the next Congress, marking what will be the largest instance of intra-party turnover in the past quarter-century.

GOP Sens. Mitch McConnell, of Kentucky; Joni Ernst, of Iowa; Steve Daines, of Montana; Thom Tillis, of North Carolina; and Tommy Tuberville, of Alabama, have all declined to seek reelection in November. Of those, most are retiring while Tuberville is seeking the governor’s mansion.

Two more, GOP Sens. Bill Cassidy, of Louisiana, and John Cornyn, of Texas, lost their primaries to Trump-backed challengers. The recent, unexpected passing of Sen. Lindsey Graham, R-S.C., brings the total to eight.

Graham was replaced with his sister, Darline Graham Nordone, for the remainder of his term, but she has not indicated that she would seek a full term, meaning the seat will count in the turnover total, one way or another.

Those departures, moreover, represent some of the most senior and influential lawmakers in the conference, setting up a dramatic reorientation of Republicans in the upper chamber. McConnell served as the previous Senate leader while Cornyn was a contender to replace him. Cassidy and Graham were each long-serving senators who held considerable sway, and Daines previously led the National Republican Senatorial Committee (NRSC).

The loss of those eight could put Senate Majority Leader John Thune in a difficult spot as he attempts to maintain party discipline. But the figure of eight assumes Republicans would hold their current seats.

Iowa, Texas and North Carolina are far from guaranteed Republican holds in November, and incumbents in Alaska, Maine and Ohio are expected to also face tight races. In a worst-case scenario for the GOP, Republicans could see a loss of those six seats without making pickups elsewhere. That would mean, moreover, that a total of 11 current Republican senators would not return in January, amounting to 21% of the current Republican conference.

Assuming the higher end of retirements and losses, that figure would represent one of the largest instances of intra-party turnover for Republicans since World War II. 

The closest instance was in 2008, but a bad election in 2026 would narrowly surpass it. In that year, five Republicans retired, with only two of those seats retained by the party. 

Five other Republicans lost their seats to Democrats while seeking reelection. Republicans lost a net of eight seats that cycle and a total of 10 pre-election senators. But, once again, Republicans are guaranteed to lose at least eight this time around, and the loss of battlegrounds could tip the figure to 11, setting up the biggest turnover of the third millennium.

But if Republicans hold on to their majority in spite of all the turnover, it will also have the noticeable effect of producing a Republican Senate likely to be far more in-step with Trump and his agenda. 

Of the 53 sitting Republicans (counting the late Graham), 29 were elected prior to 2016. The minimum replacement of eight of them would lower that figure to 21 and result in the first instance of a Republican Senate conference in which the majority were elected in 2016 with Trump, or later, during the era of his influence of major primary contests.

Whether the composition change proves of any benefit to Trump will largely depend on Republican retention of majority control in the chamber and the ability of the younger lawmakers in the conference to leverage their majority status effectively with chamber leadership.

Ben Whedon is the Chief Political Correspondent for Just the News. Follow him on X.