US defence leaders are standing firm on the Navy’s decision to fire a ship captain who sought help for his cornonavirus-stricken aircraft carrier, even as videos showed sailors cheering him as he walked off the vessel.

Videos went viral on social media Friday (local time), showing hundreds of sailors gathered on the ship chanting and applauding Navy Captain Brett Crozier as he walked down the ramp, turned, saluted, waved and got into a waiting car.

Captain Crozier was faithful to his duty—both to his sailors and his country. Navy leadership sent a chilling message about speaking truth to power. The poor judgment here belongs to the Trump Admin, not a courageous officer trying to protect his sailors. pic.twitter.com/AkGFdlYjwt — Joe Biden (@JoeBiden) April 3, 2020

Acting Navy Secretary Thomas Modly abruptly fired Mr Crozier on Thursday, saying the commander created a panic by widely distributing a memo detailing the escalating virus outbreak on his ship and pleading his leadership for help. Mr Modly said Mr Crozier “demonstrated extremely poor judgment” in the middle of a crisis.

The ship is docked in Guam, and so far 137 of the nearly 5,000 sailors on board have tested positive for the virus. The Navy has said as many as 3,000 will be taken off the ship and quarantined by Friday evening (local time) to stem the spread of the virus. Crew members are needed to remain on the shop to maintain critical systems and protecting the carrier.

On Friday (local time), Jonathan Hoffman, the chief Pentagon spokesman, said Defense Secretary Mark Esper supported Mr Modly’s decision to fire Mr Crozier from his command job. He said Mr Modly told Mr Esper he had lost confidence in the captain.

And Army General Mark Milley, chairman of the Joint Chiefs of Staff told FoxNews that he trusted Mr Modly’s judgement. He said it was a difficult decision, and that Mr Modly is accountable to the American people for it.

Mr Crozier, in his memo, warned of a growing outbreak of the coronavirus on the ship and asked for permission to isolate the bulk of his crew members on shore, an extraordinary move to take a carrier out of duty in an effort to save lives.

And he said that if commanders didn’t act quickly, they would be “failing to properly take care of our most trusted asset, our sailors.”

Videos posted online showed sailors chanting Mr Crozier’s name and applauding him as he left the ship.

A number of lawmakers have questioned the firing as too hasty a decision.

Mr Hoffman said that 41 per cent of the sailors on the ship have been tested, and results are still coming in. He said no sailors are hospitalised.

–with agencies