National security adviser Robert O'Brien and Commerce Secretary Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE will visit two regional summits in Thailand on President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's behalf this weekend, the White House announced Tuesday.

According to The Associated Press, O'Brien, who isn't technically a part of Trump's Cabinet, will attend the 10-country Association of Southeast Asian Nations (ASEAN) summit and the subsequent East Asia summit.

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At both summits, O'Brien, who became Trump's national security adviser in September after John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE was ousted, will engage in sideline talks that include other major players in the region, including China, Japan and South Korea.

Ross will head a trade delegation Nov. 3-8 in Bangkok and is set to speak at an Indo-Pacific Business Forum on Monday, the AP reports.

While Trump attended the summits in 2017, Vice President Pence attended the meetings last year in lieu of the president.

Busadee Santipataks, director-general of Thailand's Foreign Ministry’s Department of Information, told the AP that "the presence of the U.S. in these meetings will surely contribute constructively to these ASEAN-U.S. meetings.”

However, a major part of the summit that won't include the U.S. is the working of the proposed Regional Comprehensive Economic Partnership. The free-trade agreement would include all members of ASEAN and China, Japan, South Korea, Australia, New Zealand and India.

If the agreement comes to fruition it would reportedly create one of the world's largest trading blocs, accounting for roughly 45 percent of the world’s population and nearly a third of global gross domestic product.