Donald Trump has become the fourth president to face impeachment hearings, and will likely soon be the third to be impeached by the House. Rep. Joaquin Castro (D-TX) joins Joy Reid to discuss. Then: Trump appears to have the full support of Senate Majority Leader Mitch McConnell, leading many to believe that an impeachment trial in the Senate would never result in a conviction. Laurence Tribe, constitutional scholar and author of, ‘To End a Presidency,’ joins Joy to discuss, saying, ‘I do think the Democrats should press hard to make this a real trial.’ Plus: The Trump impeachment hearings have featured loud, accusatory outbursts by Republicans defending the president. USA Today columnist Kurt Bardella joins Joy suggesting that, ‘Democrats need to start fighting fire with fire.’ Next: Trump’s Attorney General William Barr has publicly disputed the findings of the inspector general that the opening of the Russia investigation was legitimate and that there was no spying on the Trump campaign. What will be the implications for potential whistleblowers? Finally: Trump’s impeachment proceedings and related events have in lot in common with Andrew Johnson’s impeachment, according to Michael Harriot, senior writer at TheRoot.com. He joins Joy to discuss. All this and more in this Saturday edition of AM JOY on MSNBC.