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Donald Trump Jr launched into a rant against London Mayor Sadiq Khan in the wake of the London terror attack outside Westminster’s Houses of Parliament.

The President’s son dug out an old article, which quoted the Mayor as saying terror attacks were ‘part and parcel’ of living in a major city.

In an interview for the Evening Standard last September, Mr Khan warned that people living in major cities “have to be prepared” for terror incidents to happen when people least expect them.

For live updates on the suspected terror attack, click here

(Image: Getty Images North America)

(Image: REUTERS) (Image: Getty Images)

He added: “That means being vigilant, having a police force that is in touch with communities, it means the security services being ready, but it also means exchanging ideas and best practice.”

Mr Trump tweeted the link along with a comment: “You have to be kidding me?!”

Donald Trump Jr’s father, the President of the United States, has been briefed on the ongoing incident in the UK capital, but has not issued an official statement.

Mr Khan responded to the shooting unfolding outside the UK Parliament in Westminster.

Mr Khan said: “There has been a serious incident near to Parliament Square this afternoon which is being treated as a terrorist attack until the police know otherwise.

“I have spoken to the Acting Commissioner. The Metropolitan Police Service is dealing with the incident and an urgent investigation is under way.

“My thoughts are with those affected and their families.

“I would like to express my thanks to the police and emergency services who work so hard to keep us safe and show tremendous bravery in exceptionally difficult circumstances."