Title: Sources: Extreme measures being considered to protect whistleblower in event of congressional testimony; House Democrats subpoena Pentagon and Office of Management and Budget, threaten to subpoena three Giuliani associates; Trump: "I'm not siding w

Trump facing bipartisan backlash over decision to clear the way for Turkish attack on U.S. -allied Kurds in northern Syria; Trump downplays prominent Republicans' criticism of his Syrian decision, says he "consulted with everybody"; Biden facing dual threats: Trump's attacks, Warren surge; New poll shows Biden stronger than Warren or Sanders in matchups against Trump in Wisconsin; NBA under fire for apologizing to China;

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