The Trump administration formally halted immigration applications from 19 countries deemed to be a high risk for producing terrorists and other national security threats — hours after a source told The Post that list could grow to 30 nations or more.

In a four-page memo issued late Tuesday, US Citizenship and Immigration Services (USCIS) directed a hold on green card and citizenship applications from those nations, as well as requests for benefits, “pending a comprehensive review.”

The 19 countries affected by the order were previously singled out by President Trump for travel restrictions in a June 4 proclamation and include Afghanistan, Burma, Burundi, Chad, Cuba, the Republic of the Congo, Equitorial Guinea, Eritrea, Haiti, Iran, Laos, Libya, Sierra Leone, Somalia, Sudan, Togo, Turkme

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