Jan. 2 (UPI) -- Travel restrictions for 20 more nations and locales took effect on Thursday in accordance with President Donald Trump's Dec. 16 order expanding travel restrictions to 39 nations.

President Donald Trump has restricted travel from a total of 39 nations and entities due to deficiencies in their respective screening and vetting processes that make it difficult to protect the United States against public safety and national security threats.

"The United States government has identified additional countries that are unable to meet basic criteria for identifying their nationals and residents who may pose national security and public safety risks, or for sharing necessary information with the United States," U.S. Customs and Immigration Services officials announced on Thursday.

"It is paramount that the United States government ensure aliens in the United States do not intend to threaten its citizens or undermine or destabilize its culture, government, institutions, or founding principles," USCIS added.

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