President Donald Trump announced Monday that he is designating North Korea as a state sponsor of terrorism.

"Today the United States is designating North Korea as a state sponsor of terrorism. Should have happened a long time ago. Should have happened years ago," Trump said during a public meeting with his Cabinet.

The President said the designation will impose "further sanctions and penalties" on North Korea in support of his administration's "maximum pressure campaign to isolate the murderous regime."

"The North Korean regime must be lawful and end its unlawful nuclear ballistic missile development and cease all support for international terrorism, which it is not doing," Trump added.

The country had been removed from the list of state sponsors of terrorism in 2008, but the Trump administration said in recent weeks the President was mulling re-listing North Korea.

Trump said on Monday that North Korea has "repeatedly" sponsored acts of terrorism, including "assassinations on foreign soil," and that the new sanctions would be announced over the coming weeks, including Tuesday by the Treasury Department, which will bring US sanctions against Pyongyang to their highest level ever.