She has a legacy of being an outspoken backbencher and already sparked speculation that she plans to run for the top job when she tweeted a graphic on Tuesday which says, “2020” and “Watch this space”.
The backbencher is likely to announce her formal bid on Friday evening according to reports.
She has never held a frontbench role, but she has captured widespread attention over the years with her campaigning on equality issues and tackling violence against women.
In the wake of the Labour Party’s disastrous December general election, she said the party needed “structural change”.
She added: “The reality is that the Labour Party has got to do a huge amount more than just think that getting rid of one man…will just simply make it OK.”