The American Civil Liberties Union (ACLU) announced Friday it will challenge President Trump's latest version of his controversial order banning travel from several countries.

The organization's executive director, Anthony Romero, accused Trump of adding North Korea and Venezuela to the now eight-nation list in order to cover up the "original sin of the Muslim ban."

“President Trump’s newest travel ban is still a Muslim ban at its core, and it certainly engages in discrimination based on national origin, which is unlawful," Romero said in a statement Friday.

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"Adding a few North Koreans and a tiny group of Venezuelan officials doesn’t paper over the original sin of the Muslim ban. We’ll see President Trump in court — again.”

On Sunday, Trump announced the newest version of the travel ban, which sets increased restrictions on foreign national entering the U.S. from eight countries: Chad, Iran, Libya, North Korea, Somalia, Syria, Venezuela and Yemen.

The new list was issued the same day that Trump’s previous 90-day ban on visitors from six Muslim-majority nations was set to expire. U.S. officials maintain that the list is based on states that failed to comply with U.S. information-sharing requirements that aim to make vetting processes stronger.

“As president, I must act to protect the security and interests of the United States and its people,” Trump said in the announcement.

"We will not admit those into our country we cannot safely vet," he added on Twitter.