Back in 1998, the former independent counsel Ken Starr saw House Republicans use his report to impeach Bill Clinton. Now, he’s watching the House race to impeachment again, this time under Democrats and in a very different way. Amid much Republican complaining, do Democrats have the authority to conduct impeachment as they are conducting it? Is it constitutional? Unconstitutional? Anti-constitutional? Plus: Is this the what-goes-around-comes-around impeachment?