Trump has faced resistance from Americans over his decision to ban refugees from seven Muslim-majority countries from travel into the United States.
Essentially this is a suspension of the US Refugee Admission Program which lasts 120 days.
The ban on Syrian Refugees is indefinite.
President Trump has said the suspension is in place in order to give government agencies time to create a stricter vetting system and ensure visas were not issued to travelers posing a national security threat.
Who is affected by the ban?
All travelers with nationality or dual nationality of Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen are not permitted to enter the US for 90 days, or be issued an immigrant or non-immigrant visa.
Exceptions can be made on a case-by-case basis.
This follows on from a law passed in 2015 by a republican lead congress that altered the visa admission program.
All other countries in the VISA waiver program are unaffected by this and are still able to apply on this website.