Theresa May is to tell the European Commission's president Brexit plans not derailed by court
The UK prime minister is expected to tell she is firm to initiate Brexit process by March in spite of the High Court's Article 50 ruling, BBC.
Theresa May is set to tell the European Commission's president Jean-Claude Juncker she still intends to start the process by March and it will not be derailed by the court.
Three judges have ruled that Theresa May cannot invoke Article 50 - to start formal exit negotiations with the EU - without Parliament's support.
But sources told the BBC that Mrs May will tell Jean-Claude Juncker she still intends to start the process by March.
The Supreme Court is expected to hear the government's appeal next month.
The BBC's political correspondent Iain Watson says Mrs May is due to outline her commitment during a telephone call to Mr Juncker later.