India, June 15 -- President Donald Trump celebrates turning 80 on Sunday with a showstopping birthday spectacle that once would have seemed unfathomable: a cage-fighting show on the storied South Lawn of the White House.

This week, the hard realities of the office have threatened to overshadow the ostentatious UFC mixed martial arts extravaganza, where combatants sealed inside a wire-mesh octagon try to punch, kick, chop and pummel each other into submission. Trump has found himself boxed into an unpopular and costly war he helped start in Iran. An agreement to end the conflict could be close, but the crucial details are still to be negotiated.

Meanwhile, about a mile from Trump's birthday bash, crews pried the president's name off the ...