The National Caretaker Committee of the Peoples Democratic Party called on Buhari to tell Nigerians the true state of his health.
The main opposition party was reacting to the inability of the President to return to Nigeria from the UK, where he had been on holiday for more than 10 days.
The PDP said it was wrong for the President to also send letter to the National Assembly, extending his leave, without telling Nigerians when he would resume.