I was listening to Ml. Ilyas Ghuman DB on his lecture on the Mamatis (which includes Wahhabis). He said it is not permissible to pray behind them. How could we justify praying behind Wahhabi imams from Saudi? Many Wahhabi imams have visited Deobandi madaaris and led salah there. How do we justify this? Is it because we do not know the explicit beliefs of these Wahhabi imams?