Good Friday morning. Here are some of the stories making news in Washington and politics today.

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• The selection process for presidential debates has taken place behind closed doors — until now. In a live television spectacle involving cards, boxes and a triple-split-screen, CNN revealed who will face off in the next set of Democratic debates. The first night will feature Senators Bernie Sanders and Elizabeth Warren, while the second will be a rematch for Joseph R. Biden Jr. and Senator Kamala Harris.

• Mr. Biden and Mr. Sanders, two of the leaders in the 2020 presidential race, are butting heads over health care. To Mr. Sanders, the health care system is broken, and the only way to fix it is to replace it with his signature policy plan, “Medicare for all.” For Mr. Biden, removing the Affordable Care Act is not an option.

• A year from their next presidential nominating convention, Democrats still don’t agree on why they lost the White House in 2016. But they have absolutely no intention of repeating their mistakes — whatever they were.