ISTANBUL 

US President Donald Trump's new travel ban, restricting entry to the US for citizens from 12 countries, took effect Monday amid growing tensions over his intensified immigration enforcement efforts.

The new proclamation, signed by Trump last week, targets citizens from Afghanistan, Myanmar, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan, and Yemen, CBS News reported.

It also enforces stricter restrictions on individuals from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan, and Venezuela.

According to guidance released Friday to all US diplomatic missions, the new ban does not cancel visas already issued to individuals from the listed countries.

However, starting Monday, applications will be denied unless the applicant qualifies for a narrow exemption.

Travelers holding previously issued visas should still be allowed to enter the US after the ban goes into effect.