Trump's frustration with Mnuchin rising after failed attempt to calm markets, source says
By Jim Acosta, Kevin Liptak & Donna Borak
Dow dives 600 points to below 22,000, S&P 500 enters bear market — worst Christmas Eve ever
By John Melloy & Michael Sheetz
Confusing signals from Washington send markets plunging
By Rich Barbieri & Nathaniel Meyersohn