President Trump also noted South Korea needs pay for the THAAD missile defense system, which the U.S. began moving to a deployment site in South Korea earlier this week. He pegged the cost of the system around $1 billion.
http://thehill.com/homenews/administration/331021-trump-takes-aim-at-south-korea-trade-deal-defense
Is he saying he wants to sell the THAAD system to Korea? Do we really want to sell our most technologically advanced missile system to a foreign country, even a friendly one?