Why did John Moolenaar warn Marco Rubio about South Korea-China ties?

He said the warming relationship between Seoul and Beijing could create significant risks for the United States. He pointed to closer leader-level ties, South Korean semiconductor investment in China and what he described as unfair treatment of U.S. firms in Korea.

What did John Moolenaar say about South Korea’s position on Taiwan?

He said Seoul had effectively ruled out supporting a regional response to any Chinese aggression against Taiwan. He cited Lee Jae Myung’s 2024 campaign remark: What does it matter to us what happens in the Taiwan Strait?

What deadline did John Moolenaar set for the State Department?

He called for a State Department briefing on developments in South Korea-China relations by Oct. 31. His letter framed the request as part of heightened vigilance over the two countries’ growing ties.

Republican committee chief urges 'heightened vigilance' over S. Korea-China ties: report

Listen

Summary

Republican Rep. John Moolenaar urged Secretary of State Marco Rubio to keep heightened vigilance over warming South Korea-China ties, warning of significant risks to the United States. He cited closer leader-level engagement, South Korean semiconductor investment in China and what he called unfair treatment of U.S. firms in Korea. He also asked for a State Department briefing by Oct. 31.

Key Facts

Moolenaar chairs the Select Committee on Strategic Competition Between the U.S. and the Chinese Communist Party.
He cited Xi Jinping’s first visit to South Korea in 11 years last year and Lee Jae Myung’s visit to China this year, which he said was the first presidential visit since 2019.
He said South Korea had effectively ruled out supporting a regional response to Chinese aggression against Taiwan.
Moolenaar also linked his warning to tensions between Seoul and Washington, including Trump’s April remark that South Korea was not helpful to the United States.
He asked for a State Department briefing on developments in South Korea-China relations by Oct. 31.

By Yonhap

Published Oct 1, 2026 12:30 am KST
Updated Oct 1, 2026 1:54 am KST

President Lee Jae Myung shakes hands with Chinese President Xi Jinping at the Great Hall of the People in Beijing, Jan. 5. Yonhap

WASHINGTON — The Republican chair of the congressional committee on U.S.-China competition has called on Secretary of State Marco Rubio to maintain "heightened" vigilance over the warming relationship between Seoul and Beijing, which he said poses "significant risks" to the United States, a report said Wednesday.

Rep. John Moolenaar (R-MI), chairman of the Select Committee on Strategic Competition Between the U.S. and the Chinese Communist Party, sent the letter, citing deepening leader-level relations between Seoul and Beijing, South Korean semiconductor investment in China and "unfair" treatment of U.S. firms in Korea compared with Chinese rivals, according to Reuters.

Moolenaar portrayed South Korea as a "major American ally" but pointed out the "potential for frictions to develop into a structural shift in Seoul's alignment."

He expressed concerns over what he called the "unprecedented" pace of leader-level engagement between Seoul and Beijing, noting that Chinese President Xi Jinping visited South Korea for the first time in 11 years last year, and that South Korean President Lee Jae Myung visited China this year, the first presidential visit since 2019, Reuters said.

The chairman also pointed to the "widening gulf" between South Korea and the U.S., claiming that Seoul had "effectively ruled out" supporting a regional response to any Chinese aggression against Taiwan. He cited Lee's related campaign remark in 2024: "What does it matter to us what happens in the Taiwan Strait?"

He called for a State Department briefing on developments in South Korea-China relations by Oct. 31.

There have been signs of tension between Seoul and Washington, as U.S. President Donald Trump has expressed his frustration about South Korea's perceived lack of support over the Iran war.

In April, Trump said that South Korea was "not helpful" to the U.S. despite Washington having stationed its troops "in harm's way" in the Asian country, which he stressed is located "right next to" North Korea's nuclear force.

Explore More