'Terrified': Trump on edge after Mueller as Dems eye obstruction

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President Trump vows to fight “all the subpoenas” coming from Congress, as the White House resists subpoenas for Trump immigration Czar Stephen Miller and Trump White House Counsel Don McGahn to testify. Ari Melber breaks down how Trump’s attempt to block congressional oversight, is about whether “elected officials are able to hold the federal government accountable as envisioned in the constitution”. The Daily Beast's Eleanor Clift, former prosecutor Jon Flannery and NBC's Matt Miller join Ari Melber.