Then, a Downing Street spokesman said Trump had offered "his condolences over this morning's cowardly attack in London", which he described to reporters earlier as "a awful thing".
The terrorist attack recorded yesterday in London underground, where a bomb exploded in a wagon causing a score of casualties, is a new and sad reminder that terrorist threat is permanent, and that all democratic societies must be vigilant.
Farage said he expects Trump's claim to be proven right. "It just keeps going and going", and suggested that the USA may not be tough enough on terror.
Trump tweeted Friday: "Another attack in London by a loser terrorist".
According to The New York Times, Trump's tweets only add to the strain that's been buckling the USA and UK's special relationship.
Islamic State (IS) has claimed responsibility for the explosion in which 29 people were hurt after an Improvised Explosive Device (IED) blasted on a Tube train at the Parsons Green Station.
In last one year, the United Kingdom has been the target of a string of Islamist-related terrorist attacks.
But according to Bloomberg, the British prime minister expressed her displeasure with Trump's remarks directly to the president himself. He added that his travel ban targeting six mostly Muslim nations should be "far larger, tougher and more specific - but stupidly, that would not be politically correct!" Trump accused the mayor on Twitter of suggesting there was "no reason to be alarmed" by the attack itself.
"Must be proactive & nasty!"
Trump has not been shy in critiquing Khan, London's first Muslim mayor, on Twitter since taking office with Khan even calling on the British government to cancel Trump's state visit. "The internet is their main recruitment tool which we must cut off & use better!" Along with advocating for a "larger, tougher" travel ban, the President also suggested shutting down the internet.
The U.S. Supreme Court is expected to hear oral arguments to decide the travel ban's constitutionality in October.
Trump was quick to criticise law enforcement in the wake of the attack and implied the assailants had been know to Scotland Yard.