President Donald Trump is set to issue a retributive endorsement as early as Monday against one of a handful Indiana Senate Republicans who opposes the White House’s mid-cycle redistricting plan.

Among the holdouts targeted by the White House: Republican state Sen. Jim Buck of Kokomo, who is facing a primary from Tipton County Commissioner Tracey Powell. Trump could back Powell Monday, according to a person familiar with his thinking speaking exclusively with Blue Light News, following through on MAGA’s and White House allies’ long-running threats to primary opponents of their mid-decade redistricting effort intended to protect their slim House majority in the midterms next year.

Trump posted on Truth Social Monday morning that he “will be strongly endorsing against any State Senator or House member from the Great State of Indiana that votes against the Republican Party, and our Nation, by not allowing for Redistricting for Congressional seats in the United States House of Representatives as every other State in our Nation is doing, Republican or Democrat.”

A spokesman for Buck did not respond to a request for comment.