A New York City male model who was brutally attacked while defending two women in Germany has slammed the nation's immigration policies.

John Rudat, 21, was stabbed multiple times and left bloodied and battered after trying to stop two victims from being violently assaulted on German public transit in the city of Dresden on Sunday.

Now, he's broken his silence to reveal his attacker was 'an immigrant, an illegal one, a drug dealer and very popularly known here, especially by the police.

'He doesn't even belong here,' he added.

Rudat claimed the immigrant attacker had been remanded several times before Sunday's attack, including for similar attempted assaults on young women.