"We have a very big trade deficit with them, and we protect them," Trump said at a private fundraiser in Missouri on Wednesday, according to an audio recording obtained by The Washington Post. "So we lose money on trade, and we lose money on the military. We have right now 32,000 soldiers on the border between North and South Korea. Let's see what happens."
In an effort to dispel confusion over the comments, a White House official said that the president "did not suggest removing American forces from South Korea" but that his administration remained committed to improving the U.S.-South Korea trade relationship for the benefit of U.S. workers.
U.S. defense officials and diplomats fielded direct calls from the Korean Embassy in Washington, but their agencies struggled to form a public response to Trump's comments, which carry significant political and security consequences for the country.
"We refer you to the White House for comment," said a State Department spokesman.
Pentagon spokeswoman Dana W. White also referred questions to the White House. "Our focus is that our relationship with South Korea is the strongest it has ever been," White said. "There is no space between Washington and Seoul, and we'll continue to support them and work together."
Trump's remarks came as negotiators from the United States and South Korea were set to meet Thursday in Washington to discuss a revision of the U.S.-Korea Free Trade Agreement, also known as KORUS. In the past, Trump has vowed to cancel the deal if Seoul refuses to help reduce the U.S. trade deficit between the two. Last year, the U.S. goods trade gap was $23 billion.
Differences over economic issues has put a strain on the U.S.-South Korea relationship just as the White House plans to organize a historic summit between Trump and North Korean leader Kim Jong Un, the first such leadership meeting of the two countries, which are longtime adversaries.
In response to Trump's decision to impose tariffs on steel and aluminum imports, South Korea pledged to "deploy all possible means" to forestall the action.
Harry Kazianis, an Asia expert at the Center for the National Interest, said South Korea is highly sensitive to any threats, implicit or not, to alter its military relationship with the United States.
Jae H. Ku, a Korea expert at Johns Hopkins University, said Trump's remarks could have political ramifications in South Korea. "The presence of U.S. troops in South Korea is critically important for domestic stability," he said. "A large majority of the southern population is still very pro-U. S. presence. Hints of U.S. pullout would send domestic politics into a tailspin in favor of the conservatives."
Trump's remarks come days after he fired Secretary of State Rex Tillerson and nominated his CIA director, Mike Pompeo, to become the country's top diplomat. The decision immediately raised questions about whether a key diplomat helping organize the Trump-Kim summit, Susan Thornton, would continue in her position or if Pompeo might seek to appoint a new assistant secretary for East Asian and Pacific affairs.
Admiral Harry Harris Jr., who heads U.S. Pacific Command, urged caution on Thursday in considering the prospect of talks with North Korea.
Asked during a congressional hearing about the proposed summit, Harris said the United States "can't be overly optimistic about outcomes."
"We'll just have to see where it goes, if and when we have the summit," he told members of the Senate Armed Services Committee.
Harris said it was too early to speculate what shape negotiations might take. "We've never been in a position where our president has met with a leader of North Korea," he said. "We have to go into this eyes wide open."
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