Stocks tumble as coronavirus fears mount; Trump on election interference: "I want no help"; Rivals turn up heat on Sanders ahead of crucial debate; Bernie Sanders fends off attacks as rivals highlight history of praising dictators

Sources: Trump weighing loyalty of potential nominees for top U.S. intelligence role; Trump downplays coronavirus threat despite new warning from centers for disease control; Lawmakers hammer Trump administration over coronavirus preparations and response; Trump says Justices Ginsburg and Sotomayor should recuse themselves from his cases; Trump promises to announce pick for top intelligence role "very shortly"; CDC warns disruption to U.S. everyday life "may be severe"; CDC Official: "We expect we will see community spread" of coronavirus; CDC: Coronavirus spread here not a question of if but when; Sanders criticized for praising Cuban literacy program; Dems push Sanders over cost of his campaign promises; Advisors say Bloomberg will focus on Sanders at debate; Top Dems debate ahead of South Carolina, Super Tuesday; Bloomberg's partner on confidentiality deals: "Get over it";

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