How do you know that?
He very well might have asked these Pastors if they would support him.
They very well might have answered in the affirmative.
Speculation on your part is no better than NBC.
But then Trump is also speculating.
The latest word from the trump campaign is that they knew not all the pastors would endorse him, but they felt it eould be too hard to explain. So they went ahead with the announcement that 100 pastors would endorse him Monday. The campaign pretty much admits to lying.