The one who would be MOST likely to disagree with Calhoun's attempt to justify slavery would be William Lloyd Garrison.
William Lloyd Garrison (1805-1879) was an American journalist that supported abolitionist in the United States. He created the newspaper "The Liberator," that supported the abolition of slaves in America, and formed the New England Anti Slavery Society, dedicated to spreading the campaign against slavery. He was an activist that tirelessly dedicated part of his life to end slavery in his country.
Pakistan has forget it's ideology long back at the time of its birth. it is country full off hate towards India, Hindus, Christian, Buddhist and even it's own different sect of Islam except Sunnis.