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

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• Senator Bernie Sanders, the Vermont independent and 2016 Democratic primary runner-up whose populist policy agenda has helped push the party to the left, announced this morning that he was running for president again. His bid will test whether he can retain the anti-establishment appeal he enjoyed with many liberal voters three years ago.

• A coalition of 16 states, including California and New York, challenged President Trump in court over his plan to use emergency powers to fund his border wall. The suit argues that the president does not have the power to divert money for constructing a wall along the Mexican border because it is Congress that controls spending.

• Barack Obama does not plan to make an endorsement in the 2020 primary. But that doesn’t mean he’s sitting the race out — behind the scenes, he has counseled more than a dozen likely candidates on how best to beat President Trump.