Tube drivers are to vote on industrial action in a row about working conditions.
The announcement has come as Conservatives on the London Assembly called for curbs on strikes on the Underground.
The union organising the ballot called that an attack on fundamental rights.
Rags Martel reports.
More top news
Hundreds of opponents to a third Heathrow runway have gathered outside the Palace of Westminster.
Elizabeth Hurley told ITV News it was vital for those who survive the disease to continue to be supported after their recovery.
The mother of Shane Virami are taking Thomas Cook and a friend of his to court over his death.