Does 'But what about a reference by MacNeil's partner, Jim Lehrer, to  some ten thousand black gold and diamond miners [on strike in South Africa]. ' challenge or dispute the premise 'Jim Lehrer made reference to black gold and diamond miners on strike in South Africa.'
But what about a reference by MacNeil's partner, Jim Lehrer, to  some ten thousand black gold and diamond miners [on strike in South Africa]. ###Jim Lehrer made reference to black gold and diamond miners on strike in South Africa.