U.S. President Donald Trump on Sunday defended a massive immigration raid by federal agents on an electric-vehicle manufacturing site in Georgia operated by South Korean automaker Hyundai, but suggested it was necessary for the U.S. to bring in foreign experts to train American workers in some industries.

Video released by U.S. Immigration and Customs Enforcement on Saturday showed a caravan of vehicles driving up to the site and then federal agents directing workers to line up outside.

"We have a lot of industries that we don't have anymore,"

"We're going to have to train people," Trump said.

"And the way you train people is bring people in that know what they're doing and let them stay for a little while and help."

South Korea says it has reached a deal with the U.S. for the release of detained South Korean workers.

Presidential chief of staff Kang Hoon-sik announced Sunday that South Korea and the U.S. finalized negotiations on the workers’ release. He said South Korea plans to send a charter plane to bring the workers home. South Korea’s Foreign Minister Cho Hyun said more than 300 South Koreans were among the 475 people detained. The raid stunned many in South Korea because the country is a key U.S. ally.