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

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• Democrats are split over whether the best path to the White House lies in the industrial heartland, where President Trump sealed his victory in 2016, or the Sun Belt, where states like Georgia and Arizona are growing more diverse — and possibly more blue.

• Robert Mueller is often portrayed as the omnipotent fact-gatherer of the special counsel investigation. But there’s a lesser known figure playing a major role: Andrew D. Goldstein, who has conducted every major interview of the president’s advisers.

• Shortly after Mr. Trump wraps up the first day of his summit meeting with Kim Jong-un in Vietnam, Michael Cohen, Mr. Trump’s former lawyer and fixer, will testify publicly against him before the House Oversight Committee.