Brian Jack, a Trump adviser, will run for Congress in Georgia

Brian Jack, political advisor to former President Donald J. Trump, papers submitted to run for Congress in Georgia on Thursday, aiming to replace a retiring Republican representative in a deeply conservative district.

Mr. Jack, who served as the last White House political director under Trump and has remained an adviser to the former president, will succeed Representative Drew Ferguson in Georgia’s Third Congressional District, which includes Atlanta’s southern suburbs. Mr. Ferguson, a four-term Republican, announced his retirement late last year.

Mr. Trump gave his “full and total” support for Mr. Jack’s candidacy in a social media post on Thursday afternoon.

“I encourage Brian, a Fayette County native, to go for it, pursue his dream and run for Congress,” Mr. Trump wrote. “He represents a new generation of leadership, and he will be a GREAT Congressman.”

In a statement, Mr. Jack, who also served as an adviser to Representative Kevin McCarthy when he was Speaker of the House of Representatives, said Mr. Trump’s endorsement “comes with great responsibility.” He added: “I will work tirelessly to earn the trust and support of my home district.”

The endorsement, as well as Jack’s larger relationship with Trump, will most likely give him a significant advantage in the May 21 Republican primary.

At least six other Republican candidates have entered the race, including Mike Crane and Mike Dugan, both former senators, and Philip Singleton, a former state representative. Those candidates could draw the ire of Mr. Trump, who has a history of holding grudges and tightening his grip on the Republican Party.

If Mr. Jack emerges from the primary, he will be virtually assured of victory in the general election in November. Mr. Ferguson defeated his Democratic opponent in the deep-red district in 2022 by more than 36 points.