National Security Advisor John Bolton outside the Pentagon on March 29, 2018. Photo: Brendan Smialowski/AFP/Getty Images

Today John Bolton starts as President Trump’s new national security adviser — his third in thirteen months — and may well become Trump‘s most influential and ideological foreign policy adviser.

What’s Next: It's too soon to tell how Bolton will interact, cooperate and compete as a member of Trump's foreign policy team. He has a reputation as a skilled bureaucratic maneuverer and infighter, though his biggest challenge may not be the bureaucracy but the all-important presidential constituency of one.

Although Bolton doesn't yet enjoy the trust Trump has in Secretary of Defense Mattis or the personal chemistry he has with Secretary of State designate Mike Pompeo, he will have several advantages. Pompeo, for example, will be on the road often, without the same day-to-day proximity to Trump, and also heads a department of diplomats Trump dislikes and dismisses.

Bolton will be charged with developing options on two critical issues — a planned US-North Korean summit and the status of the Iran nuclear accord — and planning for a third, how to respond to the Assad regime’s latest use of chemical weapons. He seems to share the president’s desire to withdraw from the Iran deal, but on North Korea where he has advocated a military option, he may face a president who wants a deal if he can get one.

Trump has called for bringing U.S. troops home from Syria. Given his hawkish stance on Iran, Bolton — though no proponent of intervening in that civil war —may prefer to keep them on the ground to counter Tehran. If he is able to help Trump through the present Syrian crisis, that could cement his credentials with the president on other issues.

The bottom line: Bolton will face a challenge in creating and sustaining a functional relationship with a president who's even even more combustible and unpredictable than he is. He may struggle to reconcile tough and ideological foreign policy views with Trump's more pragmatic and risk-averse approach, especially around the use of military force. The real question is whether he has the personal skills and emotional intelligence to handle the president.

Aaron David Miller is vice president for new initiatives and director of the Middle East Program at the Wilson Center.

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Joe Biden is calling for the winner of November's presidential election to select Ruth Bader Ginsburg's replacement on the Supreme Court.

What he's saying: "[L]et me be clear: The voters should pick the president and the president should pick the justice for the Senate to consider," Biden said. "This was the position the Republican Senate took in 2016 when there were almost 10 months to go before the election. That's the position the United States Senate must take today, and the election's only 46 days off.

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President Trump will move within days to nominate his third Supreme Court justice in just three-plus short years — and shape the court for literally decades to come, top Republican sources tell Axios.

Driving the news: Senate Majority Leader Mitch McConnell and Senate Republicans are ready to move to confirm Trump's nominee before Election Day, just 46 days away, setting up one of the most consequential periods of our lifetimes, the sources say.

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