Commerce Secretary Howard Lutnick has attempted to explain President Donald Trump's "mathematically impossible" claim that he is cutting drug prices by up to 600 percent after being grilled by a Fox News host. During Trump's Wednesday night address to the nation, where he pushed a number of mistruths and exaggerations, the president claimed he has negotiated with drug companies to cut prices by "as much as 400, 500 and even 600 percent." "Well, if you cut something by 100 percent, the cost goes down to zero," Roberts said. "If you cut it by four or five or 600 percent, the drug companies are actually paying you to take their product. So it raises the question, how much of last night's speech was hyperbole and how much was fact?" Lutnick let out a laugh during the question and said "no." He said that the figures "depend on when you look at it."