cnn original series this weekend "declassified," untold stories of american spies with mike rogers at 9:00 p.m. eastern sunday nights followed by "this is life" with lisa ling sunday night. erin burnett out front starts right now. out front next had. breaking news. the white house just subpoenaed. democrats say the president's actions have left them no choice, the impeachment probe escalates tonight. plus make pence slamming a request for uk's documents from him. it doesn't appear to be serious. really? and the other breaking news this hour, doctors are revealing moments ago bernie sanders did have a heart attack. let's go out front. good evening. i'm erin burnett. out front tonight, the breaking news. president trump's white house up subpoena. house democrats issuing a subpoena to the white house moments ago. this is part of the impeachment