Jeremy Clarkson should be sacked by the BBC over his "appalling" comments about killing striking public sector workers, trade union Unison has said.
The union said it was considering reporting the Top Gear presenter to the police over comments on The One Show.
Referring to striking workers, Mr Clarkson said: "I'd have them all shot. I would take them outside and execute them in front of their families."
The BBC received over 4,700 complaints and has apologised for the comments.
Mr Clarkson's comments, on Wednesday's screening of the BBC One show, sparked hundreds of responses to be posted on social networking site Twitter.
Talking about the strikes over pension changes, Mr Clarkson also said: "I mean, how dare they go on strike when they've got these gilt-edged pensions that are going to be guaranteed while the rest of us have to work for a living?"
Some of his remarks, which appeared to have been made in a lighthearted tone, were greeted with laughter from a studio audience, as did his comment that the strikes were "like being back in the 70s" which made him feel "at home, somehow".
Dave Prentis, general secretary of Unison, said: "Clarkson's comments on The One Show were totally outrageous, and they cannot be tolerated.
'Silly thing to say'
"An apology is not enough - we are calling on the BBC to sack Jeremy Clarkson immediately.
"We are seeking urgent legal advice about what further action we can take against him and the BBC, and whether or not his comments should be referred to the police."
He added: "Jeremy Clarkson clearly needs a reminder of just who he is talking about when he calls for public sector workers to be shot in front of their families.
"Whilst he is driving round in fast cars for a living, public sector workers are busy holding our society together - they save others' lives on a daily basis, they care for the sick, the vulnerable, the elderly."...read more