The 77-year-old longtime congressman erupted in fury after Department of Homeland Security officers burst into his office Wednesday before accusing his staff of 'harboring rioters' in scenes captured on video.

'President Trump and the Department of Homeland Security are sowing chaos in our communities, using intimidating tactics against both citizens and non-citizens in a reckless and dangerous manner,' Nadler said in statement to Politico.

'If this can happen in a Member of Congress's office, it can happen to anyone - and it is happening.'

The video footage, obtained by Gothamist, shows the moment agents restrained a weeping aide while a woman in the video says 'No she did not - that's not what happened.'

Another employee can be seen desperately demanding a warrant while asking the cop to back up. 

The female staffer was seen blocking a second officer from entering private areas of the congressional office, which is located in the same Varick Street building as the federal immigration court.

'I'm a federal officer, we're here checking on something,' the male agent tells the employee standing in his way in the video.

'We have the right to check,' he said.  'You are harboring rioters in the office. 

In the background another officer can be heard yelling 'stop resisting.' 

The heated confrontation continued until the staffer allowed the officers access to the back office.

Nadler branded the incident 'deeply troubling' and accused federal agents of violating clear legal protocols in their aggressive approach.

But Department of Homeland Security officials have insisted their Federal Protective Service officers were conducting a legitimate security check.

They claimed they received reports that protesters were hiding inside the congressional office.

'Based on earlier incidents in a nearby facility, FPS officers were concerned about the safety of the federal employees in the office and went to the location to ensure the safety and wellbeing of those present,' Homeland Security officials told the New York Post.