Sir Keir Starmer has been forced to drop changes to the way Labour elects its leaders after they were rejected by the party's left wing.
He had wanted to scrap one-member-one vote - but opponents said that would give Labour MPs too much say over who gets the top job.
Sir Keir is now hoping to get members to back a watered-down package of reforms in a conference vote on Sunday.
He says they will help the party win the next general election.
The row over Labour's constitution began earlier this week, when the leader proposed changing the way his successors would be chosen.
https://www.bbc.co.uk/news/uk-politics-58689884
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Failing miserably is not a good look. Rule number 1 as a leader, don't make a stand if you are not certain to win