Wall Street jitters amid worries Trump tax cut bill will add trillions to massive US debt pile

There's a high stakes political showdown underway in Washington at the moment over Donald Trump's proposals for more tax cuts in the United States. Some congressional repubicans - who'd normally back Mr Trump - are nervous about how to pay for the additional tax breaks in the face of concerns the proposal could add trillions to Amerca's already massive debt pile. ABC's Peter Ryan explains.