Ken Livingstone has been indefinitely suspended from Labour over claims he made anti-Semitic remarks during rants about Hitler.
The former London mayor has been suspended from the party for the past ten months and had been due to see the penalty expire in April.
But in a rare move, Mr Livingstone will stay suspended after outgoing Iain McNicol signed an order to extend the punishment.
Ken Livingstone (file image) has been indefinitely suspended from Labour over claims he made anti-Semitic remarks during rants about Hitler
Labour moderates had been alarmed at the prospect Mr Livingstone could be reinstated as a full member of the party.
His current suspension is the second handed down to him over a series of bizarre rants about Hitler and Zionism.
Mr Livingstone has always insisted that he said Hitler had supported Zionism at one time, not that Hitler was a Zionist.
A Labour spokeswoman said: 'Ken Livingstone has been administratively suspended from the Labour Party, pending the outcome of an internal party investigation.
'That suspension starts on the date that his membership suspension applied by the National Constitutional Committee ends on 27 April 2018.'
In other developments today, the Corbynite chair of the Momentum campaign group has triggered a power struggle at the top of Labour by challenging a Unite union official for the role of party general secretary.