Labour Party leadership candidate Burnham has gained the support of 349 party MPs in the House of Commons. This effectively eliminates any internal challenge, securing Burnham as the sole candidate.
According to Labour Party leadership election rules, candidates must, between the 9th and 15th of this month, obtain the nominations of 81 Labour MPs in the House of Commons (including themselves), and by the evening of the 16th, receive nominations from at least three Labour-affiliated organizations, of which at least two must be trade unions. Only those who meet both thresholds are eligible to stand.
There are currently 403 Labour MPs in the House of Commons. Given Burnham's current level of support, it is impossible for any other potential challenger to meet the nomination threshold. If Burnham later fulfills the affiliated organization nomination requirement, the Labour Party will hold a conference on the 17th to directly announce him as the new leader, and he will immediately become the UK Prime Minister.
Burnham is currently a Member of Parliament in the House of Commons and previously served as Mayor of Greater Manchester.