Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE responded to the terror attack in Istanbul on Tuesday by warning that the “terrorist threat has never been greater” and calling for the United States to ramp up security measures.

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“Our prayers are with the families of those killed and injured in Istanbul,” said a Trump campaign statement on Tuesday. “The whole world is stunned and horrified.”

Nearly 50 people were killed when several suicide bombers attacked the Istanbul Ataturk Airport on Tuesday. No group has yet claimed responsibility for the attack.

“The terrorist threat has never been greater,” the statement continued. “Our enemies are brutal and ruthless and will do anything to murder those who do not bend to their will. We must take steps now to protect America from terrorists, and do everything in our power to improve our security to keep America safe.”

The presumptive Republican presidential nominee has called for a ban on Muslims from entering the country in response to terror attacks in San Bernardino, Calif., Paris and Orlando, but has recently leaned toward a country-specific policy.

On Tuesday, a Trump adviser told The Hill that Trump would draw back on the proposal if he is elected.