Saudi Arabia, the United Arab Emirates and Bahrain have said they are withdrawing their ambassadors from Qatar because Doha had not implemented an agreement among Gulf Arab countries not to interfere in each others' internal affairs.The three countries said the move was necessary "to protect their security and stability". But Qatar called the move a "big mistake".Al Jazeera speaks with Nasser Bin Hamad Al Khalifa, the former Qatar ambassador to the UN and US