Billionaires, burner phones, alleged bribes: The impeachment trial of Texas Attorney General Ken Paxton is going to test the will of Republicans senators to oust not only one of their own, but a firebrand who has helped drive the state’s hard turn to the right for years.

The historic proceedings set to start in the state Senate Tuesday are the most serious threat yet to one of Texas’ most powerful figures after nine years engulfed by criminal charges, scandal and accusations of corruption. If convicted, Paxton — just the third official in Texas’ nearly 200-year history to be impeached — could be removed from office.