President Trump renewed his call for the courts to approve his executive order banning travel from six Muslim-majority countries Saturday amid reports of a "major incident" in London Saturday night.

"We need to be smart, vigilant and tough. We need the courts to give us back our rights," Trump tweeted Saturday evening. "We need the Travel Ban as an extra level of safety!"

While the Trump administration and the U.K. have not yet called the incident a terrorist attack, Prime Minister Theresa May has released a statement saying the incident was being investigated as a "potential act of terrorism."

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