I don't believe it unless the source is named or if GWB is on tape saying it.
George Junior ran and hid on 9-11. Then he padded into a Mosque to stammer nonsense about “religion of love”. Then he killed a few thousand Americans invading the wrong country while letting Saudis escape justice. Then he spent the rest of his failed presidency trying to open our borders and ram a massive illegal alien amnesty down our throats.
Leaking attacks on Trump is completely consistent with this bozo’s behavior.