Allegedly he'll pick up the phone even for numbers he doesn't recognise. I guess to convince him you have to make it clear how your idea will increase the glory and honour of Donald J Trump.

In all seriousness i think that combo is better then a senior citizen who can barely be reached by his own advisors and is unclear how much of the situation he actually understands. (with Trump it's either zero, Fox News or 4d chess depending on who you ask, but the answer will always be given with confidence).