Britain's Prime Minister Theresa May. (Photo by Matt Cardy / POOL / Getty Images) (Photo credit should read MATT CARDY/AFP/Getty Images)

Theresa May has insisted she will not be forced into watering down her Brexit plan during negotiations with the EU.

Writing in the Sunday Telegraph, the Prime Minister says she will “not be pushed” into compromises on her chequers agreement that are not in the “national interest”.

But Mrs May also warns she will not “give in” to those calling for a second referendum on the withdrawal agreement.

She says it would be a gross betrayal of our democracy and trust.

The people’s vote, a cross-party group including some MPs, is calling for a public vote on the final Brexit deal.

The UK is on course to leave the EU on 29 March and the government had previously ruled out another referendum.