The conservative firebrand and former top aide to Sen. Ted Cruz has been a thorn in the side of Trump and Speaker Mike Johnson. Trump had called for a primary challenge against Roy.

It will be the first test of whether Roy’s at times frosty relationship with President Trump — and his turn against Paxton — can withstand scrutiny in a statewide primary.

A Republican congressman from Texas, Chip Roy, says he's running for state attorney general. Roy is a prominent member of the House Freedom Caucus, a conservative faction that wields outsize influence in the narrowly divided House.