Who sponsored the president's daughters trip to the US with Aisha Buhari?

I find it bizarre in the first place that this kind of question must crop up.Are they saying the President can't afford what an averagely successful Nigerian family can do?
Official Spokesperson to President Buhari. Garba Shehu has responded to a question on who sponsored the president's daughters to the Aisha Buhari trip to US. See his response below.

Recall that most Nigerians have been slamming president Buhari's wife Aisha for travelling with her daughters and even her makeup artist to the US with tax payers money.