During the dialogue, South Korea took issue with the rising import restrictions put in place by Washington, including safeguard duties on Korean washers and solar panels and the proposed steel duties, while the US called for easing non-tariff barriers in the auto sector, according to Seoul officials with knowledge of the meeting. The two sides will continue to talk on Friday to delve further into major issues.

Trump signed off on the 25-percent tariff last week, giving temporary exemptions to only Canada and Mexico while the renegotiation of the North American Free Trade Agreement is under way.

As Trump uses the tariffs as leverage to draw up a better NAFTA deal, South Korea is also facing pressure to accept US demands in negotiations to revamp the two countries' six-year-old bilateral FTA.

On the sidelines of the negotiation, South Korean trade minister Kim Hyun-chong also met with US Trade Representative Robert Lighthizer in an effort to get Seoul exempted from proposed steel product tariffs.

Seoul has repeatedly asked the Trump administration to exempt it from the steep tariffs, citing close economic and security ties, but it was not included in the initial list of exempted countries. The duties will go into effect late next week.

South Korea-US bilateral trade reached $119.3 billion last year, according to government data. Seoul's trade surplus fell to $17.8 billion from $25.8 billion in 2015 on sluggish sales of autos and steel and increased consumption of US beef and natural gas. (Yonhap)