Trump’s Case Against Responding to Congress’s Subpoena https://www.thebulwark.com/trumps-case-against-responding-to-congresss-subpoena/
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In response to the congressional subpoena for Trump's testimony, Trump's lawyers "argue that Congress may not issue a subpoena for the purpose of law enforcement, because 'those powers are assigned under our Constitution to the Executive and the Judiciary.'
Trump should be careful what he’s wished for. Attorney General Merrick Garland is far from finished."