Rahul Gandhi, Mallikarjun Kharge and other Congress leaders criticised the police action, calling it an attack on democratic rights and peaceful protest.
Delhi Police said Wangchuk was shifted to Safdarjung Hospital on expert medical advice and in compliance with the Delhi High Court's directions after his health deteriorated.
The Cockroach Janta Party alleged a police crackdown on protesters, while police appealed to demonstrators to vacate the Jantar Mantar protest site peacefully.