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BREAKING: Trump seeks to block Treasury Department from handing over his tax returns to Congress

Rachel Maddow

Why all eyes are on Lamar Alexander at Trump impeachment trial

00:46

Former Senator Claire McCaskill and Lawrence O'Donnell explain why retiring Tennessee Republican Senator Lamar Alexander is seen by many as a bellwether for how Republican senators who are on the fence about Donald Trump's impeachment could ultimately vote on issues like allowing witness testimony.Jan. 23, 2020

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