AUSTIN (CBSDFW.COM/AP) — He spent 22 years in Congress and now former Rep. Pete Sessions of Texas is expected to run again in 2020 but not in his old Dallas district, which Democrats flipped last year.

Prominent Republican megadonor Roy Bailey and two GOP operatives with knowledge of the decision told The Associated Press that Sessions will run for the rural central Texas seat of outgoing Rep. Bill Flores.

Bailey, who is finance co-chairman of President Donald Trump’s reelection campaign, said he has discussed the decision extensively with Sessions. The two GOP operatives requested anonymity to discuss Sessions’ candidacy.

“He has been motivated by the Democrats move towards impeachment of our duly elected President,” Bailey said in a text message to the AP.

U.S. Rep. Pete Sessions (R-TX) speaks to members of the media as he arrives at a House Republican Conference meeting June 7, 2018 in Washington, D.C. H(credit: Alex Wong/Getty Images)

Sessions was a longtime GOP party leader and once the campaign chief for House Republicans. He was ousted when Democrat Colin Allred defeated him for the 32nd Congressional District seat in Dallas and Collin Counties — a loss that was further proof of Texas’ big cities growing more liberal.

Flores’ district runs through Waco, where Sessions was born, and is considered a safe Republican enclave. An announcement was scheduled for Thursday in Waco.

Flores is one of 20 House Republicans leaving Congress next year. Seventeen are retiring after their current term and three have resigned or already left office.

Sessions didn’t face a Democratic challenger in 2016, but his district voted for Hillary Clinton over Trump.

Two years later, Democrats won Sessions’ seat and another near Houston that is now represented by Rep. Lizzie Fletcher, and they’re targeting six more they narrowly lost in 2018. All run through suburbs where shifting demographics and an aversion to Trump among educated women are weakening the GOP.

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)