In the otherwise scripted impeachment trial, it was a rare spontaneous moment: Sen. Lindsey Graham, one of President Donald Trump’s chief defenders, stopped Rep. Adam Schiff, the lead prosecutor, to shake his hand and compliment him on his arguments for Trump’s removal. Schiff is the face of the House’s impeachment case against Trump, which has made him the principal target of Trump’s ire. Though he has six managers by his side, House Speaker Nancy Pelosi appointed Schiff, her confidant, as the lead impeachment manager. He is setting the tone of the prosecution’s case. “In a way I do feel like...