Donald Trump Jr. has criticized London Mayor Sadiq Khan, shortly after the terror attack on the UK capital that killed four people on March 22.

President Donald Trump’s son tweeted an article written last year, in which Sadiq Khan said terror vigilance had become “part and parcel” of life in a global city.

“You have to be kidding me?!” said Donald Trump Jr., immediately sparking accusations that he was exploiting the tragedy and misrepresenting the mayor’s point.

Dozens were hurt in the London attack.

The attacker drove a car through pedestrians on Westminster Bridge and then fatally knifed a police officer who tried to stop him entering the Houses of Parliament. He was then shot dead.

Two hours later, Donald Trump Jr. tweeted an article from the Independent newspaper in September 2016.

The tweet added: “Terror attacks are part of living in a big city, says London Mayor Sadiq Khan.”

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In the article, Sadiq Khan was speaking shortly before a meeting with New York Mayor Bill De Blasio, on the day after three bombs exploded in New York City and nearby towns, wounding 29 people.

The attacks had given him a sleepless night, he said, as he pondered the dangers faced by big Western cities like New York and London.

“Part and parcel of living in a great global city is you have to be prepared for these sorts of things, you have to be vigilant, you have to support the police doing an incredibly hard job, you have to support the security services,” Sadiq Khan said.

On March 22, after the attack in Westminster, Mayor Khan said that Londoners “will never be cowed by terrorism” and that the city stood together in the face of those seeking it harm.

Sadiq Khan, London’s first Muslim mayor, has previously clashed with Donald Trump Jr’s father, in January denouncing his travel ban as “shameful and cruel”.

In 2016, Sadiq Khan accused the then-candidate Trump of being “ignorant” about Islam.

Donald Trump responded by challenging the mayor to an IQ test.

The president’s eldest son, who now manages his father’s business and has no White House role, has been accused of insensitivity before.

During the election campaign, Donald Trump Jr. sparked a swift backlash when he compared Syrian refugees to poisoned Skittles, to justify not allowing any into the US.

Donald Trump Jr. has made no statements about his tweet on Sadiq Khan, telling the New York Times that he is not prepared to comment on every tweet.