Angela Eagle will announce her bid for the leadership of the Labour Party on Monday, according to Eagle.
Eagle resigned as shadow business secretary last week, and claimed that party leader Jeremy Corbyn failed to “lead an organized and effective” party.
Corbyn’s spokesperson insisted that he would remain as Labour leader and fight any leadership challenge.
This comes after Labour deputy leader Tom Watson called off talks with unions aimed at resolving the standoff.
Confirming her bid, Eagle said she would “explain my vision for the country and the difference a strong Labour Party can make” on Monday.
“I urge all my colleagues to listen very carefully to [the unions] and indeed come together to oppose what this government is doing to the most vulnerable within our society.
“The real pressure is when you don’t have enough money to feed your kids, when you don’t have a roof over your head, when you’re wondering if you’re going to be cared for.”
-Jeremy Corbyn, Labour party leader
“We are talking about a leadership challenge against Jeremy Corbyn. But we could be talking about something even bigger – a possible split in the Labour party.”
-Tom Watson, Labour party deputy leader