Sessions' endorsement in February meant Trump had more Senate support than either Ted Cruz or Bernie Sanders at the time. With Jeb Bush throwing in the towel also in February, the entire establishment GOP was melting down so bad over Trump that many establishment Republicans saw Cruz as the only way to stop Trump and possibly throw the nomination into a brokered convention.
No one, by the way, gaslights better than they do. It's the secret of their success.
