President Trump speaks at the White House. Photo: Doug Mills - Pool/Getty Images

President Trump unloaded on his former defense secretary via Twitter on Wednesday, hours after James Mattis condemned him for making a "mockery of our Constitution" in his response to mass protests in the wake of George Floyd's killing.

What he's saying: "Probably the only thing Barack Obama & I have in common is that we both had the honor of firing Jim Mattis, the world’s most overrated General. I asked for his letter of resignation, & felt great about it. His nickname was 'Chaos', which I didn’t like, & changed it to 'Mad Dog'"

  • "His primary strength was not military, but rather personal public relations. I gave him a new life, things to do, and battles to win, but he seldom 'brought home the bacon'. I didn’t like his 'leadership' style or much else about him, and many others agree. Glad he is gone!"

Reality check: Trump did not create the "Mad Dog" nickname during his administration as he claimed. News reports as far back as 2004 have used the informal title.

  • Mattis resigned in 2018 after clashing with Trump on the administration's decision to withdraw U.S. troops from Syria.

Go deeper: James Mattis condemns Trump as a threat to the Constitution

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Biden's doctrine: Erase Trump, re-embrace the world

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

Former Special Counsel Robert Mueller testifies before the House Permanent Select Committee on Intelligence on Capitol Hill on Wednesday July 24, 2019. Photo: The Washington Post / Contributor

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

Trump wearing a face mask in Walter Reed National Military Medical Center on July 11. Photo: Alex Edelman/AFP via Getty Images

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.