"I'll comment after we come back. I don't need headlines. I don't want to make their move successful." — President Trump aboard Air Force One

Why now?: Bush 41 and 43 are quoted saying unkind things about Trump in the forthcoming book "The Last Republicans: Inside the Extraordinary Relationship Between George H.W. Bush and George W. Bush."

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Biden on Supreme Court fight: "This is about whether or not the ACA will exist"

Joe Biden made health care the overwhelming focus of his remarks from Wilmington, Delaware, on Sunday, stressing that the Senate confirmation battle over Judge Amy Coney Barrett's nomination to the Supreme Court is about preserving the Affordable Care Act in the midst of a pandemic.

Why it matters: Democrats are aggressively pushing the message that Barrett, who has previously criticized Chief Justice John Roberts for his 2012 ruling salvaging the ACA, will seek to invalidate the law when the Supreme Court hears a Trump administration-backed lawsuit against it on Nov. 10.

McMaster: Trump's peaceful transition comments are a "gift to our adversaries"

President Trump's refusal to commit to a peaceful transfer of power if he loses November's presidential election is a "gift to our adversaries," Trump's former national security adviser H.R. McMaster said Sunday.

The big picture: McMaster, a retired three-star general, said that the American people must understand that the military will have "no role" in a presidential transition and that it's "irresponsible" to even talk about it as a possibility.

Trump says Supreme Court ending Obamacare would be "a big WIN"

Photo: Spencer Platt/Getty Images

President Trump on Sunday tweeted that the Supreme Court invalidating the Affordable Care Act would be "a big WIN for the USA!"

Why it matters: Democrats have argued that confirming a Trump-appointed justice to the Supreme Court would put the Affordable Care Act, which protects pre-existing conditions, in jeopardy. Trump's Supreme Court pick, Amy Coney Barrett, has written that she disagreed with Chief Justice John Roberts when he ruled to uphold the law.