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Speaker Nancy Pelosi has begun a formal impeachment investigation of President Trump, saying he \u201cmust be held accountable.\u201d We spoke to our colleague who was at the announcement and to one of the lawmakers who helped convince Ms. Pelosi that it was time. Guests: Nicholas Fandos, who covers Congress for The New York Times, and Representative Mikie Sherrill, Democrat of New Jersey. For more information on today\u2019s episode, visit nytimes.com/thedaily.\xa0\n\nBackground reading:\xa0Though the outcome is uncertain, the inquiry raises the possibility that Mr. Trump could become only the fourth president in American history to face impeachment.After months of caution from House Democrats, why is this happening now? \u201cThey believe the new accusations against Mr. Trump are simple and serious enough to be grasped,\u201d our colleague Carl Hulse writes in a news analysis.Here\u2019s how the impeachment process works.