Speaker Kevin McCarthy has ordered an impeachment inquiry into President Biden, putting into motion the third formal attempt by Congress to remove a president in the past four years.Luke Broadwater,  a congressional reporter for The Times, explains the unique realities behind this one.Guest: Luke Broadwater, a congressional reporter for The New York Times.Background reading: 

• Mr. McCarthy, who formerly argued that the House must vote before opening an impeachment inquiry, changed his tune this week.
• What we know about the impeachment case against Mr. Biden.

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