On Tuesday’s First Light, former White House national security adviser John Bolton says he is "prepared to testify" if he is subpoenaed by the Senate in the impeachment trial of President Trump.  Congress expects to be briefed Wednesday on the killing of  Iran's top general, nearly a week after President Trump's ordered it.  Kevin Carr reviews the new thriller “The Grudge”. Michael talks to expert Kiersten Todt about a potential cyber threat from Iran. And correspondent Karen Caifa checks in from Las Vegas with a look at the future as seen from the Consumer Electronics Show.