Meet young Donald Trump, a 'pioneer of self-promotion'

On the eve of the Republican National Convention, two biographers of the presumptive GOP presidential nominee Donald Trump -- Michael D’Antonio, author of “Never Enough: Donald Trump and the Pursuit of Success” (now in paperback as “The Truth About Trump”) and David Cay Johnston, author of the “The Making of Donald Trump,” – share their insights with NewsHour’s Political Director Lisa Desjardins.