On 5 April 2009, Hizb ut-Tahrir Wilayah Pakistan demonstrated in Lahore, Karachi and Islamabad  against the arrival of US Joint Chiefs of Staff Chairman, Michael Mullen, and the US Special Envoy Afghanistan and Pakistan, Richard Holbrooke. Demonstrators held placards saying "Holbrooke go home - No aid for the drones". The protestors stated that the real reason for the current wave of destabilization in Pakistan is the American presence in the region. The protest called for the Pakistan Army to give the material support (Nusrah) to Hizb ut-Tahrir for the establishment of the Khilafah "Caliphate".