The French foreign ministry issued a statement about what Trump said about their country and its laws and took the chance to express their "firm disapproval" of his thoughts and opinions (and the fact that he chose to share them).
In a speech to the National Rifle Association (NRA) on Friday, Trump said that the Paris rampage could have ended differently if civilians had been armed.
Other French politicians including the mayor of Paris took issue with Mr Trump's comments after he acted out the scene of the massacre by Islamist assailants at Paris' Bataclan concert hall, where 90 of the 130 victims of the attacks died.
"Every country freely decides on its own laws on carrying firearms, as in other areas", it said.
The former French president Francois Hollande called Trump's claims "shameful and obscene", and French Prime minister at the time of the attacks, Manuel Vanlls, called the US President "indecent and incompetent". They "said a lot about what he thinks of France and its values", he added. "What more can I say?"
Mr Trump, who is due to visit Britain on July 13, told NRA members that a "once very prestigious" London hospital, which he did not name, had become overwhelmed with knife attack victims.
"They were brutally killed by a small group of terrorists that had guns".
That marks Paris's strongest criticism of the USA president since his French counterpart Emmanuel Macron took office a year ago. "They have knives and instead, there is blood all over the floors of this hospital", he said.
The attacks left 130 people dead and hundreds injured.
Last month, trauma surgeon Martin Griffiths told the BBC that some of his colleagues had likened the Royal London Hospital in east London where he works to the former British military base Camp Bastion in Afghanistan.
A senior London surgeon, Prof Karim Brohi, hit back by saying it was "ridiculous" to suggest guns could help combat knife violence. "We are proud of our world-leading service and to serve the people of London", he added in a statement. The head of States wishes that the country was free to carry a firearm.
"Gunshot wounds are at least twice as lethal as knife injuries and more hard to fix". Trump pointed his hand as if it were a gun while describing how each of the victims in Paris was fatally shot.
"The statistics on gun crime victims do not make us want to change this choice", it said.