The Caliphate as is termed in English is central to islam and an absolute basic necessity.

The method adopted by Hizb ut-Tahrir to convey the da'wah is Shari'ah Law derived from the seerah of the Messenger of Allah (saw) in his performance during the conveyance of the da'wah. This is so because it is obligatory to follow him, as Allah (swt) says,