Dow drops 640 points for the worst Christmas Eve trading day on record

US stock markets plunged more than 2.2%, even more notable after their most brutal week since 2008. European markets also slumped.
Treasury Secretary Steve Mnuchin's call with the heads of six major US lenders Sunday was a bizarre attempt to stem brutal recent losses in markets. It backfired.
Fears that the US government shutdown could continue into January, and Trump's suggestion that he aims to fire Fed Chairman Jerome Powell, have hit market confidence.Investors balked at chaos in the White H