Hizb ut-Tahrir Britain (also HT Britain, HTB, HT in the United Kingdom, HTUK) is the British branch of Hizb ut-Tahrir, a transnational, pan-Islamist and fundamentalist group that seeks to re-establish "the Islamic Khilafah (Caliphate)" as an Islamic "superstate" where Muslim-majority countries are unified and ruled under Islamic Shariah law, and which eventually expands globally to include non-Muslim states such as Britain.