Trump’s ire is being fueled by his stalled legislative agenda and, to a surprising degree, by his decision last month to back the losing candidate Luther Strange in the Alabama Republican primary. “Alabama was a huge blow to his psyche,” a person close to Trump said. “He saw the cult of personality was broken.”
-Vanity Fair
He even deleted his tweets of endorsement/support.
Rand Paul after golf with Trump: 'The President never loses, didn't you know?'
(CNN)