WASHINGTON (AP) – The Supreme Court is letting the Trump administration enforce its 90-day ban on travelers from six mostly Muslim countries, overturning lower court orders that blocked it.

The action Monday is a victory for President Donald Trump in the biggest legal controversy of his young presidency.

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In a statement released Monday, Trump said the Supreme Court’s decision is a “clear victory for our national security.”

“As President, I cannot allow people into our country who want to do us harm. I want people who can love the United States and all of its citizens, and who will be hardworking and productive,” the statement read. “My number one responsibility as Commander in Chief is to keep the American people safe. Today’s ruling allows me to sue an important tool for protecting our Nation’s homeland. I am also particularly gratified that the Supreme Court’s decision was 9-0.”

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Trump said last week that the ban would take effect 72 hours being cleared by courts.

The justices will hear arguments in the case in the fall.

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