washington u.s. president donald trump tell reuters thursday either renegotiate terminate call horrible free trade deal south korea say seoul pay u.s. anti-missile system price billion interview reuters trump call five-year-old trade pact south korea unacceptable say would target renegotiation administration complete revamp north american free trade agreement nafta canada mexico blame u.s.-korean trade deal know korus 2016 democratic presidential election opponent hillary clinton secretary state promote final version trade pact approval congress 2011 unacceptable horrible deal make hillary republican trump say horrible deal go renegotiate deal terminate it ask would announce intention renegotiate deal trump say soon announce now trump 's comment stun south korean financial market send seoul stock .ks11 currency krw= reverse even country 's economic outlook start brighten south korea foreign ministry say seoul would continue explain trump administration benefit free trade deal washington officially file request seoul renegotiate agreement say government keep monitor situation continue efforts explain unite state mutually reciprocal outcome south korea-u.s. fta prepare countermeasures ministry say global demand improve export goods cars electronics lead recovery south korea number trade-reliant asian economies japan taiwan boost manufacture sectors talk actual policy different high-ranking official south korea finance ministry decline identify authorize speak media tell reuters korus initially negotiate republican administration president george w. bush 2007 version scrap renegotiate president barack obama democratic administration three years late u.s. goods trade deficit south korea double since korus take effect march 2012 13.2 billion 2011 27.7 billion 2016 accord u.s. census bureau data trump say terminal high-altitude area defense thaad missile system deploy south korea defend potential missile attack north korea would cost billion question unite state pay inform south korea would appropriate pay billion-dollar system trump say phenomenal shoot missiles right sky ask remark south korea defense ministry say statement change exist agreement seoul provide land deployment washington shoulder cost instal operate system moon jae-in south korean presidential frontrunner say new government give choice decide whether agree deployment decide sufficient public consensus parliamentary approval say televise presidential debate ahead may election top foreign policy adviser early tell reuters trump suggestion would impossible option u.s. military operate system u.s. military start deployment thaad early march despite strong opposition china worry system powerful radar use spy territory lockheed martin corp lmt.n prime contractor thaad system former u.s. state department official estimate cost system 1.2 billion say unite state would want sell thaad seoul want retain thaad arsenal consistent u.s. weapons systems deploy korean peninsula retain right redeploy official say speak condition anonymity exclusive trump vow fix scrap south korea trade deal want missile system payment