Donald Trump Jr. and Eric Trump told ABC News that the United Kingdom needs to do more to defend against terrorism


President Donald Trump‘s sons are backing their father in his one-sided Twitter feud with London Mayor Sadiq Khan — sparked by his response to the London Bridge terror attack on Saturday.

Donald Trump Jr. and Eric Trump told ABC News that the United Kingdom needs to do more to defend against terrorism.

“We keep appeasing it,” the president’s eldest son said Monday. “And we keep saying, “Okay, it’s gonna be great. We’re gonna hold fast and we’re gonna ‘keep calm and carry on.’ Maybe we have to keep calm and actually do something.”

“Keep Calm and Carry On” was a phrase produced by the British government at the beginning of World War II to raise morale and encourage fortitude during troubling times. It continues to be a slogan associated with the nation today.

“You should be alarmed,” Eric said. “Because this has become the new norm. And it’s not right. And we, as a society, especially as Americans, better do something about it.”

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Trump lashed out at Khan just hours after the terror attack, mocking the mayor’s response to the tragedy and criticizing “political correctness.”

“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, 70, tweeted.

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He added, “At least seven dead and 48 wounded in terror attack and Mayor of London says there is ‘no reason to be alarmed’!”

The comment came from an interview Khan did with the BBC regarding the police action being taken after the attack.

“Londoners will see an increased police presence today and over the course of the next few days. There’s no reason to be alarmed,” the mayor said.

In a formal statement posted to Twitter early Sunday morning, Khan condemned the attack and asked that people in London remain vigilant.

“Pathetic excuse by London Mayor Sadiq Khan who had to think fast on his ‘no reason to be alarmed’ statement,” Trump tweeted on Monday morning. “MSM is working hard to sell it!”

WATCH: London Attack Kills Seven and Injures Dozens

Seven people were killed and at least 48 injured in a London terrorist attack Saturday night – less than two weeks after a suicide bombing in Manchester and one day before an emotional charity concert for the victims of that attack.

On Saturday, three attackers careened a white van into pedestrians on London Bridge. The men then pulled knives and ran toward Borough Market as they attacked victims on the street and in pubs, Commissioner for the Metropolitan Police, Cressida Dick, said in a statement on Sunday.

Armed police responded within eight minutes and shot and killed all three men at Borough Market. The assailants were wearing what appeared to be fake explosive vests, Metropolitan Police Assistant Commissioner Mark Rowley told reporters.

The Metropolitan Police confirmed that they arrested 12 people in connection to the attack.