A Republican senator who lost his primary after Trump turned on him is warning the party faces a brutal two years — bad news for Trump and GOP control of the Senate.

• John Cornyn lost the Texas GOP Senate primary runoff to Ken Paxton after Trump backed Paxton, despite Cornyn voting with Trump 99.3% of the time.
• Cornyn says Republicans are in for a "bumpy ride" and predicts a disastrous November election for the party.
• Paxton is seen as a far weaker candidate — heavily investigated, and his own state party once tried to expel him — making the seat easier for Democrat James Talarico to contest.
• The attacks on Talarico, mostly personal smears, don't appear to be landing.

Outlook: Picking loyalty over the stronger candidate could cost Republicans the Texas seat and their Senate majority, weakening Trump for his final two years.