Former Trump national security adviser John Bolton says he will testify in a Senate impeachment trial if he is subpoenaed. Meanwhile, tensions are high as Iran vows revenge for the death of top general killed in a U.S. airstrike. CBS News national security correspondent David Martin, White House correspondent Weijia Jiang, and CBSN political contributor Molly Hooper joined CBSN to discuss. Subscribe to the CBS News Channel HERE: http://youtube.com/cbsnews
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