The executive order "Protection of The Nation From Foreign Terrorist Entry Into The United States" notes that the steps taken by the US in the aftermath of 9/11 has not been able to deter terrorists from entering the country.
"Numerous foreign-born individuals have been convicted or implicated in terrorism-related crimes since September 11, 2001, including foreign nationals who entered the US after receiving visitor, student, or employment visas, or who entered through the US refugee resettlement program," it said.
"I'm establishing new vetting measures to keep radical Islamic terrorists out of the United States of America. We don't want them here," Trump said after he signed the executive order in his first visit to the Pentagon, a week after he was sworn in as the President.
"We want to ensure that we are not admitting into our country the very threats our soldiers are fighting overseas. We only want to admit those into our country who will support our country and love deeply our people," Trump said.
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Deteriorating conditions in certain countries due to war, strife, disaster, and civil unrest increase the likelihood that terrorists will use any means possible to enter the US, the executive order said.
The US must be vigilant during the visa-issuance process to ensure that those approved for admission do not intend to harm Americans and that they have no ties to terrorism, it said.
In addition, the US should not admit those who engage in acts of bigotry or hatred (including "honour" killings, other forms of violence against women, or the persecution of those who practice religions different from their own) or those who would oppress Americans of any race, gender, or sexual orientation, it said.
The order also prevents all persons from Iraq, Syria, Iran, Sudan, Libya, Somalia or Yemen from entering the country for 30 days.