countries, as well as Iran and Malaysia, ban Israeli citizens, however exceptional entry to Malaysia is possible with approval from the Ministry of Home Affairs. Certain countries may also restrict entry to those with Israeli stamps or visas in their passports. As a result of tension over the Artsakh dispute, Azerbaijan currently forbids entry to Armenian citizens as well as to individuals with proof of travel to Artsakh. Between September 2017 and January 2021, America did not issue new visas to nationals of Iran, North Korea, Libya, Somalia, Syria, or Yemen pursuant to restrictions imposed by the Trump administration, which were subsequently repealed by the Biden administration on 20 January 2021. While in force, the restrictions were conditional and could be lifted if the countries affected meet the required security standards specified by the Trump administration, and dual citizens of these countries could still enter if they presented a passport from a non-designated country. Prescreening A significant number of countries maintain prescreening facilities for passengers departing from other jurisdictions to clear border controls prior to arrival and thereby skip checkpoints upon arrival. Aside from simplifying arrival formalities, this enables border control authorities to deny entry to potentially inadmissible travellers prior to their embarking and to reduce congestion at border checkpoints located at ports of arrival. Hong Kong and Mainland China: There are two border crossings between Hong Kong and the Chinese mainland at which border controls imposed by the two jurisdictions are colocated: West Kowloon Railway Station (): A component of the Guangzhou–Shenzhen–Hong Kong Express Rail Link (), West Kowloon Station contains a "Mainland Port Area ()", essentially enabling passengers and goods to clear mainland Chinese immigration on Hong Kong soil. Shenzhen Bay Port (): The land border checkpoint at Shenzhen Bay Port in the mainland contains a Hong Kong Port Area () which enables passengers and goods to clear Hong Kong border controls in the mainland. The checkpoint is located in the Chinese mainland on land leased from the city of Shenzhen in Guangdong province. By enabling travellers to clear both Chinese and Hong Kong border controls in one place, it eliminates any need for a second checkpoint on the Hong Kong side of the Shenzhen Bay Bridge. Singapore and Malaysia: Woodlands Train Checkpoint (, , ): For cross-border rail passengers, Singaporean exit and Malaysian entry preclearance border controls are co-located at the Woodlands Train Checkpoint in Singapore, whilst