The new restrictions replace the expired travel ban that barred residents of Iran, Libya, Somalia, Sudan, Syria and Yemen. An administration official said that Sudanese officials were cooperating with the United States and that the country was engaged with the U.S. in "robust" counter-terrorism efforts, which contributed to Sudan being taken off the list.
In a White House statement, Trump said he was fulfilling his "sacred obligation" to ensure the safety and security of the American people by issuing the new travel order.
But Becca Heller, director of the International Refugee Assistance Project, said that of the three countries added, "Chad is majority Muslim, travel from North Korea is already basically frozen and the restrictions on Venezuela only affect government officials on certain visas".
For everyone else, they'll go into effect on October 18. Unlike the previous orders, Sunday's proclamation is meant to be in place indefinitely. All citizens of north Korea and Chad are thus denied access to the u.s. territory, while the prohibition is limited to members of a long list of governmental bodies of venezuela and their families.
This is the third revision of the Executive Order that bans travel to the USA from Iran, Libya, Somalia, Syria and Yemen.
Originally, 17 nations were slated to be affected, but roughly half came into compliance with US regulations when presented with the new prohibitions.
Such a grace period may prevent mass confusions and chaos across USA airports seen in late January, when the initial travel ban took effect immediately upon Trump's announcement.
The American Civil Liberties Union said in a statement the addition of North Korea and Venezuela "doesn't obfuscate the real fact that the administration's order is still a Muslim ban".
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"Making America Safe is my number one priority", President Trump tweeted Sunday evening.
The restrictions on travel to the U.S. from Venezuela concern only "government officials of Venezuela who are responsible for the identified inadequacies" in screening and vetting procedures there, the proclamation reads.
The travel ban is different for countries such as Venezuela.
New requirements include "issuing electronic passports, sharing criminal data, reporting lost and stolen passports, and sharing more information on travelers", according to the White House.
The officials said that those individuals who are covered by the previous executive order that the president signed but do not benefit from court ordered exceptions will be covered from the time of signature of the proclamation Sunday.
The revised order was also challenged by several federal judges and set for an argument at the Supreme Court on October 10.
While Donald Trump has claimed that actions like travel ban are being taken to "protect the safety and security of the American people", his order might face massive criticism as it did last time he imposed a travel ban.
However Sudan - which was on the original ban on Muslim-majority countries - has been taken off the list.