Tonight on the Last Word: The World Health Organization raises the global risk of coronavirus to the highest level. Also, Gene Sperling talks to Ali about stocks having its worst week since the financial crisis in 2008. South Carolina voters hit the polls tomorrow. Plus, Trump nominates Rep. John Ratcliffe to be Director of National Intelligence - again. And drastic measures are taken to combat climate change in Charleston, SC. Ron Klain, Laurie Garrett, Zerlina Maxwell, Eugene Robinson, Rep. Raja Krishnamoorthi and Cal Perry also join Ali Velshi.