The former leader of South Korea's main opposition party Moon Jae-in said today he would run for president while adding that the issue of deploying a U.S. anti-missile system should be pushed back to the next presidential administration.<br/><br/>On the contentious missile system, Moon told a news conference that It is inappropriate for a U.S. anti-missile system deployment process to go on under the current political circumstances.<br/><br/>South Korea's next presidential election is due in 2018, but it could be held sooner if a Constitutional Court upholds a parliamentary vote to impeach President Park Geun-hye.