“However, there can be no negotiation about the re-creation of the Caliphate; there can be no negotiation about the imposition of Sharia law…”
British Home Secretary Charles Clarke, speaking at the Heritage Foundation on October 5, 2005 [full speech here and download pdf here].
Post Script
Contrast this with someone who speaks with knowledge about the Caliphate:
“All pious Muslims well-read in the Hadith (the compiled sayings of the Prophet*) firmly believe in the need to establish an Islamic State headed by a Muslim Caliph. This is mentioned twice in the Holy Quran and it’s central to the Islamic faith. No Muslim scholar would debate an Islamic state and the caliphate.”
[Sami Moubayed, Syrian historian and former Carnegie Scholar, writing in the Daily Telegraph, 23rd September, 2015]
*ﷺ Peace and blessings of Allah be upon him