A giant Baby Trump protest balloon was knifed and deflated by someone unhappy with its appearance during the US president’s trip to Alabama, organisers said.

The incident occurred during President Trump’s visit to watch the University of Alabama football game.

The balloon, which is more than 20 feet tall, was set up in a nearby park.

A deflated Baby Trump balloon at Monnish Park in Alabama (Stephanie Taylor/The Tuscaloosa News via AP)

Mr Girvan said the unidentified man was arrested. Tuscaloosa police did not immediately respond to a request for more details.

The orange, nappy-clad, mobile phone-clutching caricature of the president is often taken to Trump appearances as a way to protest against him.

Baby Trump first rose over London when local activists brainstormed a way to troll the president. Now several groups raise money to bring balloon replicas around the US.

President Donald Trump and first lady Melania Trump during a NCAA college football game between LSU and Alabama (Andrew Harnik/AP)

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The day had been going mostly smoothly, Mr Kennedy said. Some people yelled “Trump 2020” as they passed while others posed for selfies with the balloon.

But then Mr Kennedy said a man sidled up on the back of the balloon and attacked it with a knife. He ran away but was caught by police officers, Mr Kennedy added.

Mr Kennedy said he has accompanied Baby Trump to many appearances and never witnessed an attack on the balloon, although someone did stab a Baby Trump balloon in London earlier this year.

“It is rare to get that kind of anger,” Mr Kennedy said.