Trump and Pence squared off in the desert. It was one-sided.

They rallied on Friday in a bunting-clad arena wearing “Still my president” T-shirts, offering wild conspiracies about the last election and certainty that Trump would win the next one.

For them, Pence — and every vestige of the old, establishment wing of the GOP — is in the past.

“He was a good guy,” one attendee said.

“I don’t have an opinion on [Pence],” said another, who was eager to persuade Trump to “head up a…