The structure, known as "The Claw," for the upcoming UFC fight that US President Donald Trump will host as part of the 250th anniversary of the United States is seen on the South Lawn of the White House.
Donald Trump celebrates his 80th birthday in typically forceful style on Sunday, as the oldest US president ever to take office holds a bloody cage match on the White House lawn.
The unprecedented "UFC Freedom 250" event will see 14 Ultimate Fighting Championship stars beat each other to a pulp in a giant arena called The Claw.
Costing $60 million, it's linked to this year's festivities for the 250th anniversary of US independence, but it also happens to fall on the day that Trump enters his ninth decade.
Critics have derided the violent extravaganza in America's most famous backyard, saying it is in poor taste during a war with Iran that has sent prices soaring for ordinary people.
