Acting chief of staff backtracks on apparent confirmation of Ukraine quid pro quo

Democrats say they are armed with new evidence in their impeachment inquiry – and this time it comes straight from the president's acting chief of staff and on national television. In a remarkable news conference Mick Mulvaney acknowledged President Trump withheld nearly $400 million in military aid from Ukraine as he demanded Ukraine investigate Democrats. Hours later, he later tried to walk back those words that confirmed a quid pro quo took place. Nancy Cordes reports.