Jóhannesson said his favourite football team was Manchester United and he was "fundamentally opposed" to pineapple on pizzas.
If Iceland's president had his way, no sweet chunks of tropical goodness would ever be found on a slice of savoury pie ever again.
The president of Iceland shared his disdain for pineapple on pizza by announcing he would ban the topping.
Jóhannesson was recently asked by a schoolchild how he feels about pineapple pizza toppings. According to a poll on Visir, 60% of local readers liked pineapple on their pizza, while 40% hated it.
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The government has already rejected the petition, however, saying it will " extend the full courtesy of a state visit ". MPs will consider Theresa May's invitation for Trump to meet the Queen in response to a petition signed by 1.8m people.
Of all the pizza toppings out there, pineapple has always been the most polarizing.
Guðni appeared to soften his take on pizza on Tuesday, when he took to Facebook to address the controversy. "I do not have the power to make laws which forbid people to put pineapples on their pizza", he wrote in English. "I would not want to hold this position if I could pass laws forbidding that which I don't like", he continued. According to Iceland Magazine, Guðni now holds approval ratings as high as 97 percent.
He did, however, say that he is a fan of seafood pizza - which may not sound very appetizing to our North American palates.