Pete Hegseth, President-elect Donald Trump’s pick for defense secretary, was questioned about ASEAN during a heated Senate confirmation and struggled with his response.

In a heated Senate confirmation hearing for Pete Hegseth, Sen. Tammy Duckworth grilled the proposed defense secretary over the Association of Southeast Asian Nations, asking him if he could name one member and how many countries were in the bloc.

During his confirmation hearing, Trump’s Defense Secretary nominee couldn’t name a single member of the Southeast Asian bloc.

Hegseth responded at the heated Senate confirmation hearing that he couldn’t tell Duckworth the exact number of ASEAN nations, but that “I know we have allies in South Korea and Japan in AUKUS (a pact between Australia, the United Kingdom and the U.S.) with Australia.”

Even though Trump has not officially been inaugurated, the Senate can confirm cabinet members before his Oath of Office.

The 10-nation bloc, known as ASEAN, has been useful for the United States in countering China’s influence in the Indo-Pacific. Many member nations have territorial disputes with China, which has become increasingly assertive in pressing those claims.

U.S. Representatives Jason Crow and Gabe Evans talked to CBS News Colorado about the nominee who has faced criticism over his views on women in the military and an allegation of sexual assault.