Ustad al-Kull Állāmah Átā Muhammad Bandyālwī writes: 'The one who forbids Na'arah Tahqīq Haq Chār Yār is a rāfidī and hypocrite (munāfiq). In fact, this slogan takes precedence over and is superior to the slogans of Haydarī and Ghawthiyyah. No rightly guided Sunni would ever prohibit it because Haq Chār Yār is the age old emblem and hallmark of Ahl al-Sunnah. And whoever calls himself Sunni yet interdicts this slogan, then he is an inner rāfidī and is feigning Ahl al-Sunnah as taqiyyah (disguising).' [Sayf al-Átā, p.141-2]
Mufti Sahib is a great and top sunni scholar of Ahlus Sunnah. Brother Al Mustafa please try to add Mufti Sahib's Jummah Speeches regular on the net.
Khateeb e Ahle Sunnat, Najm ud Din Mufti Muhammad Ansar ul Qadri speaks on the occasion of Jummah on the topic of the proclamation of the slogan of Nara-e-Tahqiq and whether or not it is justified to reply with haq chaar yaar. (Starts at 16:00 Minutes) Jummah speech recorded at Jamiyat Tabligh Ul Islam, Toller Lane Masjid, Bradford on Friday 27th May 2011. http://www.youtube.com/watch?v=6oP_Ju6dXsw