Citizens of the 38 countries, which are part of the visa waiver programme, would no longer be able to get an automatic entry into the United States if they have visited these four countries - Iran, Iraq, Sudan and Syria - after March 2011, the State Department said.
The State Department said any traveller who receives notification that they are no longer eligible to travel under the Visa Waiver Programme (VWP) are still eligible to travel to the US with a valid nonimmigrant visa issued by a US embassy or consulate.
White House Press Secretary Josh Earnest said the goal here is to improve and tighten the screening measures that were in place for those individuals that had recently travelled to countries that were the state sponsor of terrorism.
"We want to make sure that we are doing everything that is necessary to keep the country safe. That is the top priority. But we also don't want to unnecessarily disadvantage American businesses that are trying to do business overseas, because ultimately that's good for our economy, it's good for creating jobs here in the United States," he said in response to a question.
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the nations of Iran, Iraq, Sudan and Syria," Earnest said.
The restrictions that have been put in place do not prevent individuals from travelling to the United States.
"What they do is they subject individuals that have recently travelled to these countries to more screening. And that's an important thing for people to understand," he said.
Currently, the Visa Waiver Programme allows citizens of participating countries to travel to the US without obtaining a visa. Thirty-one of the 38 countries in the programme are European nations, with some Asian countries included as well, according to the State Department.
The vast majority of foreign fighters who have joined ISIS or other terrorist groups and then returned to the West have gone to Iraq and Syria. Syria, Iran and Sudan are also designated as state sponsors of terrorism, according to the State Department.