Gordon Brown is to discuss residency rights for Gurkhas with campaigner Joanna Lumley, sources have said.
The Prime Minister is to meet the actress as he bids to defuse anger over the issue among the public and Labour backbenchers.
Ms Lumley is due to make a statement on the talks.
Earlier, Ms Lumley fuelled speculation over which senior Royal had sent her a letter indicating their support for her campaign.
"It was not the Duchess of Cornwall," she said.
"No one knows who it was - it was something I wanted to keep completely private."
The Prince of Wales is colonel-in-chief of the Royal Gurkha Rifles, a British Army unit of soldiers from Nepal.
The actress also told the Home Affairs Committee that she had written to Mr Brown to request a meeting three times but received only one reply from an aide.
The Government suffered an humiliating defeat over its proposals for extending residency rights for Gurkhas in the Commons last week, when Labour rebels sided with opposition parties to call for a more generous deal.