President Donald Trump on 28 January signed an executive order that calls for "extreme vetting" of people entering the US from certain Muslim-majority countries, a move he said is aimed at keeping "radical Islamic terrorists" out of America.
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 11 September, 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.
The move fulfills the vow Trump made on the campaign trail to limit Muslim immigration to the United States.
"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.
"We will never forget the lessons of 9/11 nor the heroes who lost at the Pentagon. They were the best of us. We will honour them not only with our words, but with our actions, and that's what we're doing today," said Trump flanked by Defence Secretary Gen (rtd) James Mattis and the Vice President Mike Pence.
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 order to protect Americans, the US must ensure that those admitted to this country do not bear hostile attitudes toward it and its founding principles," the executive order said adding that the US cannot, and should not, admit those who do not support the Constitution, or those who would place violent ideologies over American law.
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 executive order suspends the US Refugee Admissions Programme for 120 days until it is reinstated "only for nationals of countries for whom" members of Trump's Cabinet deem can be properly vetted.
The order also prevents all persons from Iraq, Syria, Iran, Sudan, Libya, Somalia or Yemen from entering the country for 30 days.