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.

Democratic Senator Tammy Duckworth, born in Bangkok to a Thai mother and an American father, posed the question to Pete Hegseth.

Sen. Tammy Duckworth put Pete Hegseth’s foreign policy chops to the test during his confirmation hearing on Tuesday as President-elect Trump’s pick to lead the Pentagon. The Illinois Democrat asked Hegseth to name one country in ASEAN,

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.”

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.