They need 2 large(ish) aircraft.
I suspect it will be one ER jet, ie a 777, 787, A330, A350 and a 737, A319 size aircraft.
The big beast for LR missions, or those with lotsa pax, the smaller one for regional visits or where the bigger beast doesn't fit.
In an election I think both leaders are supposed to have equal access. Might be a problem with the above scenario.