London Mayor Sadiq Khan said on Thursday he had no response to the criticism in a tweet by Donald Trump Jr. following a terrorist attack outside the British Parliament, saying he has been "doing more important things."

“I’m not going to respond to a tweet from Donald Trump Jr., I’ve been doing more important things over the past 24 hours," Khan said.

President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's eldest son on Wednesday shared an article from September in The Independent that described Khan’s reaction to a bombing then in the Chelsea neighborhood of New York City.

"You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan," Trump Jr. tweeted.

You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan https://t.co/uSm2pwRTjO — Donald Trump Jr. (@DonaldJTrumpJr) March 22, 2017

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In the September story, Khan said being prepared for terrorism attacks was "part and parcel of living in a big city."

During his Thursday interview with CNN, Khan focused on London's recovery following the attack, which killed four people.

"What I do know is that the threat level in London and across the country is severe, that means an attack is highly likely," Khan said. "Terrorists hate the fact that whether it’s New York, whether it’s London, whether it’s Paris, whether it’s Brussels, Istanbul, whether it’s Madrid — we have diverse communities living together peacefully getting on with each other, respecting each other.

"We’ve got a situation where Parliament is returning to normal today, City Hall is returning to normal today, tourists are returning to London today, business are returning to normal today — just the things that the terrorists hate. I’m not going to allow terrorists to divide London, to destroy our way of life. We haven’t in the past, not currently, not in the future."