Stephen Miller "was running a sort of secret immigration think tank out of the West Wing," the N.Y. Times' Julie Davis and Mike Shear report in "Border Wars: Inside Trump's Assault on Immigration," out Tuesday.

Quick take: Miller is Trump's top immigration adviser and the engineer of the administration's hardline policies. Miller allegedly pushed for the resignation of former Homeland Security Secretary Kirstjen Nielsen because she pointed out legal barriers to Trump's immigration plans.

What they're saying in the book:

"The group, which usually met on Fridays, was part of a quiet but methodical effort... to seize control of the machinery of government and use it to make good on the president’s immigration agenda ... Miller moved his task force’s meetings to his small office on the top floor of the West Wing, jamming 15 or 20 people around a conference table..."
"They scribbled their plans on large white flip charts, and the list of what they had to do grew longer and longer. They discussed overhauling the way the United States admits skilled workers, revamping ICE’s enforcement priorities and strategies for enhancing visa security. One early assignment from Miller was for the group to scour the immigration statutes and look for grounds of in-admissibility that were not being enforced."
"Another target was an old but ill-defined standard that said the country did not have to admit anyone who was likely to become dependent on the government for survival. That one would ultimately become an obsession for Miller."

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Photo illustration: Sarah Grillo/Axios. Photo: Bastiaan Slabbers/NurPhoto, and Bastiaan Slabbers/NurPhoto via Getty Images

Foreign policy will look drastically different if Joe Biden defeats President Trump in November, advisers tell Axios — starting with a Day One announcement that the U.S. is re-entering the Paris Climate Agreement and new global coordination of the coronavirus response.

The big picture: If Trump's presidency started the "America First" era of withdrawal from global alliances, Biden's team says his presidency would be the opposite: a re-engagement with the world and an effort to rebuild those alliances — fast.

Robert Mueller speaks out on Roger Stone commutation

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Former special counsel Robert Mueller responded to claims from President Trump and his allies that Roger Stone was a "victim" in the Justice Department's investigation into Russian interference in the 2016 election, writing in a Washington Post op-ed published Saturday: "He remains a convicted felon, and rightly so."

Why it matters: The rare public comments by Mueller come on the heels of President Trump's move to commute the sentence of his longtime associate, who was sentenced in February to 40 months in prison for crimes stemming from the Russia investigation. The controversial decision brought an abrupt end to the possibility of Stone spending time behind bars.

Trump dons face mask during Walter Reed visit

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President Trump wore a face mask during his Saturday visit to Walter Reed National Military Medical Center, according to AP.

Why it matters: This is the first known occasion the president has appeared publicly with a facial covering as recommended by health officials since the coronavirus pandemic began, AP writes.