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Here’s what you need to know:

Trump critic bows out, with a bang.

• “Reckless, outrageous and undignified behavior has become excused and countenanced as telling it like it is when it is actually just reckless, outrageous and undignified. And when such behavior emanates from the top of our government, it is something else. It is dangerous to a democracy.”

That was Senator Jeff Flake, challenging both President Trump and Republican leaders on Tuesday in an extraordinary speech in which he announced he would not seek re-election next year.

After tangling with the president for months, Mr. Flake faced worsening poll numbers in Arizona. He now joins what our chief Washington correspondent, Carl Hulse, calls “a new type of freedom caucus”: Republicans who are free to speak about Mr. Trump without fear of the political backlash.