Shou Zi Chew, the CEO of Chinese-owned social media app TikTok, has repeatedly asserted that he has no links to China’s Communist Party.

“Senator, I’m Singaporean. No,” he replied when US Senator Tom Cotton repeatedly asked about his links to the ruling party in China at a hearing in Washington DC on Wednesday.

“You often say that you live in Singapore,” Cotton said before demanding to know where Chew’s passport was from (Singapore, obviously) and whether he’d applied for citizenship in China or the US (no, said Chew).

“Have you ever been a member of the Chinese Communist Party?” he then asked abruptly, as if hoping to catch Chew by surprise. Chew’s response wasn’t shocked so much as fed up. “Senator! I’m Singaporean!” he reiterated. “No.” (Singapore is not part of China.)