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Al-Haafidh Ibn Hajar said in �al-Fath�: "The Fuqahaa (Jurists) are in agreement concerning the obligation to give obedience to the Sultaan who took over them by force and also to perform Jihaad along with him. [And that] obeying him is better than rebelling against him due to what this would contain of the shedding of blood and subduing of the common masses." Related in Fathul Baaree (7/13).

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Shaykh 'Abdul-Lateef Ibn �Abdur-Rahmaan Ibn Hasan aalush-Shaykh said, "And the People of Knowledge� are unanimously agreed concerning giving obedience to the one who took over them by force in whatever constitutes goodness. They see it necessary to fulfill his orders and hold the correctness of his Imaamah, leadership. No two people [amongst them] differ concerning that. They also deem it impermissible to rebel against him with the sword and to divide the Ummah, even if the leaders are sinful, so long as they do not see clear open disbelief. The various texts [of these Jurists] from the four Imaams and other than them and their likes in this regard are [certainly] present."  Majmooâ??ur Rasaa`il wal-Masaaâ??ilun-Najdiyyah (3/128)

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Shaykhul-Islaam Muhammad Ibn 'Abdul-Wahhaab said: "The Imaams from every Madhhab are agreed concerning the one the forcefully took over a region or regions that he has the ruling of "Imaam" in all matters. If this had not been so then the affairs of the world would never have been established. This is because for a very long time, before the era of Imaam Ahmad till this day of ours, the people have never gathered behind a single Imaam. And they do not know anyone from the Scholars who has mentioned that any of the Sharee�ah rulings cannot be correct [effected, implemented] except by the overall Imaam [the Khaleefah]." ad-Durarus-Sunniyyah fil-Ajwibatun-Najdiyyah (7/239)