On Saturday evening, a terrorist attack on the popular London Bridge left 7 people dead and at least 48 injured.

The attack has put US President Donald Trump and London Mayor, Sadiq Khan at loggerheads over gun control.

The London Mayor is a gun control supporter while President Trump apparently is not.

“At least 7 dead and 48 wounded in terror attack and Mayor of London says there is ‘no reason to be alarmed!’,” Trump wrote on Twitter on Sunday.

“We must stop being politically correct and get down to the business of security for our people. If we don’t get smart it will only get worse,” Trump added in the tweet.

Trump’s tweet referred to speech by Khan seeking to reassure London residents and visitors, that “Londoners will see an increased police presence today and over the course of the next few days. There’s no reason to be alarmed” in an interview with BBC radio.

Khan also took to Twitter with his message of reassurance as well: “We are all shocked and angry today – but this is our city. We will never let these cowards win and we will never be cowed by terrorism.”

But Khan would have none of Trump’s criticism. So, following Trump’s barrage of tweets, the London mayor’s press office said: “He (Khan) has more important things to do than respond to Donald Trump’s ill-informed tweet that deliberately takes out of context his remarks urging Londoners not to be alarmed when they saw more police – including armed officers – on the streets.”

It also noted that Khan “is busy working with the police, emergency services and the government to coordinate the response to this horrific and cowardly terrorist attack.”