President Trump introduced the new measure earlier this week.

US President Donald Trump has introduced new measures for foreign nationals interested in visiting the White House.

If you are planning to visit the United States and visiting the iconic White House, you need to contact your respective embassy first.

According to reports, visitors from outside the US must now apply for places for a White House tour. In order to do so, they must contact the embassy of their respective country. The embassy will then process the request for the tour.

British citizens, however, might have a difficult time as UK citizens cannot approach their embassy to apply for a White House tour. According to the British Embassy in Washington, the US Department of State has put tour applications on hold without citing any reason.

The British Embassy in Washington has suggested potential British tourists to consider tours of the US Capitol Building instead. Tours of the Pentagon are also up for grabs but non-US nationals must submit the British Embassy's mailing address instead of their home address.

Below are the instructions stipulated on whitehouse.gov for potential tourists.