Accept, for a moment, Joe Biden’s contention that he is as mentally as sharp as ever. Then try to explain some revelations of the books beginning to appear about his presidency: that he never held a formal meeting to discuss whether to run for a second term; that he never heard directly from his own pollsters about his dismal public standing, or anything else; that by 2024 most of his own cabinet secretaries had no contact with him; that, when he was in Washington, he would often eat dinner at 4.30pm and vanish into his private quarters by 5.15; that when he travelled, he often skipped briefings while keeping a morning appointment with a makeup artist to cover his wrinkles and liver spots. You might think that Mr Biden—that anyone—would welcome as a rationale that he had lost a step or two. It is a kinder explanation than the alternatives: vanity, hubris, incompetence.

AMERICA’S SUPREME COURT appears unusually uncertain about how to resolve Trump v CASA—a case that could redefine who qualifies as an American citizen and reshape the limits of judicial power. At issue is the 14th Amendment’s promise of citizenship for “all persons born or naturalised” in America. For more than 125 years this has been understood to grant automatic citizenship to almost everyone born on American soil (the children of diplomats and soldiers of invading armies are exceptions). Donald Trump has issued an executive order that claims the clause was never intended to apply to children of undocumented immigrants and temporary visa-holders.