Donald Trump is known for stirring up controversy on Twitter.
When he shared his thoughts on how to deal with the Notre Dame fire this week, a West Yorkshire fire chief responded by branding the US president an 'almighty half wit'.
Mr Trump suggested 'flying water tankers' could be used to extinguish the flames, which devastated the 850-year-old Gothic cathedral on Monday.
He wrote: "So horrible to watch the massive fire at Notre Dame Cathedral in Paris.
"Perhaps flying water tankers could be used to put it out. Must act quickly!"
West Yorkshire Fire and Rescue Service deputy chief fire officer Dave Walton was quick to hit back.
He tweeted: "Of all the almighty half wits in the world...Your expertise in firefighting is on a par with your grasp of humility, equality and honesty.
"Arguably the most unwelcome and ill founded firefighting tip ever issued by anyone ever."
Others agreed with Mr Walton that dropping tonnes of water from a height might not be the best idea.
Ade Lyden, watch commander with West Midlands Fire Service, said: "Let's totally destroy the 800 year old cathedral by dropping tonnes of water onto it when its structure is already weakened.
"And next week we have Trump on how to split the atom using a Swiss Army knife."
Mr Walton said the suggestion was "ludicrous" and pointed out that a Paris fire department spokesman had said as much.
The spokesman said: "All means are being used, except for water-bombing aircrafts which, if used, could lead to the collapse of the entire structure of the cathedral."
It has also been suggested that dropping tonnes of water from a height could have injured people around the cathedral.
The entire cathedral was minutes away from total destruction, officials say.
However, Is there still hope for the Notre Dame cathedral after the devastating fire? after 400 firefighters tackled the flames.
Is there still hope for the Notre Dame cathedral after the devastating fire?
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