But during his campaign he said the teachers had his “full support” and told activists: “It’s really important that you get politicians to come out and support you and stand with you on this.
“I am very proud to do that, to be with you this morning and support you through this campaign, both as a Member of Parliament here, from the shadow cabinet and as a candidate for leader of the Labor Party.
“My leadership, if I win it, will stand with you and other campaigns like you so that we can win [on] questions like this that are so important.”
‘Proud trade unionist’
Sir Keir described himself as a “proud unionist” in a campaign video and had joined UCU workers on a separate line in December 2019 in the week before the general election.
But this summer he has stopped supporting recent fighting on the railways, despite saying he supported workers’ “right to do that”.
The Momentum campaign group, which was first set up to support Jeremy Corbyn’s hard-left policies, said his comments represented “the leadership we were promised and then denied”.
The group said in a statement: “We will not let Keir Starmer drive a wedge between Labor and the trade union movement. Championing the interests of workers is the founding mission of the Labor Party.
“In the coming weeks we will be campaigning across the country for all Labor MPs to stand with Labour.”
Diane Abbott, MP for Hackney North and Stoke Newington and one of Corbyn’s closest political allies, tweeted the footage saying: