President Donald Trump has branded Sadiq Khan a "national disgrace" following a spell of violence in the capital.
The President took to Twitter again to voice his opinions on the Mayor after five attacks took place in London in less than 24 hours this weekend - three of which proved fatal.
The thread of tweets continue a well-established feud between the two men.
Trump had previously insulted Mayor Khan in a tweet before he'd even stepped off the plane for his state visit to the UK.
On Saturday June 15, the President quote tweeted a post from controversial right-wing commentator Katie Hopkins about the attacks that took place in "Stab-City".
Trump posted: "LONDON needs a new mayor ASAP. Khan is a disaster - will only get worse!" to Katie's tweet which read: "20 hours in Stab-City UPDATE 2 stabbed to death, 1 shot dead, Three stabbed - but not dead. Wandsworth & Tower Hamlets. This is Khan's Londonistan."
The 73-year-old Republican followed up his tweet with another quote tweet, saying: "He is a national disgrace who is destroying the City of London!" in response to a US user's post reading: "Khan is the reason I don't feel like visiting London anytime soon."
In a response to the US President, Mr Khan's spokesperson said thoughts are with the victims' families and he is "not going to waste his time responding to this sort of tweet."
The Mayor himself later tweeted: "Violent crime has no place in our city, and there's no higher priority for me than Londoners' safety."
Labour leader Jeremy Corbyn was quick to defend the London Mayor and said Khan is "rightly supporting the police to do their job while Katie Hopkins spreads hateful and divisive rhetoric".
Police have made 14 arrests - including several boys and a girl - following the five separate attacks in London.
