Donald J. Trump’s acceptance of his party’s nomination put an exclamation point on a triumphant week for a Republican Party that emerged from its convention confident and unified. At the same time, the Democratic Party is moving closer and closer to replacing President Biden on the ticket. Jonathan Swan, who covers Mr. Trump’s presidential campaign, gives a behind-the-scenes look at the Republican National Convention, and Reid J. Epstein, who covers Mr. Biden’s re-election campaign, discusses where it stands as expectations are rising among Democrats that the president will reconsider his decision to stay in the race.