Donald Trump Jr., the eldest son of 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, slammed the mayor of London on Wednesday following an attack outside of the British Parliament.

“You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan,” Trump Jr. wrote on Twitter, including a link to a September article by a British newspaper.

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

The article quotes Khan as stating after a bombing in Manhattan that terrorist attacks are “part and parcel of living in a big city."

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Khan, the first Muslim mayor of London, has been an outspoken critic of President Trump. Khan has called Trump "ignorant," asked for British Prime Minister Theresa May to cancel a planned Trump state visit to the United Kingdom and welcomed Americans interested in emigrating after Trump's election in November.

According to multiple reports, police shot an alleged attacker outside of Parliament on Wednesday. A police officer inside the Houses of Parliament was reportedly stabbed, while a car struck multiple people on the Westminster Bridge.

The City of London Police said they are treating the assault as a terrorist attack.

The president told reporters at the White House that he had been briefed on the attack but declined to provide further comment.

"I was just getting an update on London. Some big news having to do with London just happened,” he said.