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

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• In an extraordinary public altercation with the Democratic congressional leaders Senator Chuck Schumer and Representative Nancy Pelosi, President Trump said that he would be “proud to shut down the government for border security.” Read the story and five takeaways from the conversation.

• The Oval Office exchange between Mr. Trump and Ms. Pelosi was one of the rare times the president has been challenged so directly in public, especially by a woman. Here’s how the likely new speaker approached the combative conversation.

• As Democrats gear up for 2020, candidates are questioning whether they should use super PACs. But for those from donor-rich states like California and New York, the choice represents one of the earliest and potentially more consequential crossroads of the nascent primary.