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South Korean presidential hopeful casts doubt over US missiles

  • Possible South Korean presidential contender Moon Jae-in laughs during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)

    Possible South Korean presidential contender Moon Jae-in laughs during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)  (The Associated Press)

  • Possible South Korean presidential contender Moon Jae-in speaks during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)

    Possible South Korean presidential contender Moon Jae-in speaks during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)  (The Associated Press)

  • Possible South Korean presidential contender Moon Jae-in speaks during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)

    Possible South Korean presidential contender Moon Jae-in speaks during a press conference at the Seoul Foreign Correspondents Club in Seoul, South Korea, Thursday, Dec. 15, 2016. Opposition politician Moon says South Korea should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats. (AP Photo/Ahn Young-joon)  (The Associated Press)

A possible South Korean presidential contender says the country should reconsider its plans to deploy an advanced U.S. missile defense system to cope with North Korean threats.

Opposition politician Moon Jae-in said Thursday the security benefits of having Terminal High-Altitude Area Defense, or THAAD, would be curtailed by worsened relations with neighbors China and Russia.

Recent opinion polls have shown Moon as a presidential favorite amid the popular anger over President Park Geun-hye, whose powers were suspended after lawmakers last week voted to impeach her over an explosive corruption scandal.

South Korea's Constitutional Court has up to six months to decide whether Park should permanently step down. If Park is formally removed from office, the country would hold a presidential election within 60 days.