Former prime ministers Tony Blair and Sir John Major have urged parliament to reject Boris Johnson's "shameful" attempt to override parts of the Brexit Withdrawal Agreement.

The PM has said the European Union is threatening to impose a customs border in the Irish Sea, separating Northern Ireland from the rest of the UK.

The bill would go against the Withdrawal Agreement signed by the UK and EU.

It addresses the Northern Ireland Protocol - the part of the Brexit Withdrawal Agreement designed to prevent a hard border returning to the island of Ireland.

Writing in the Sunday Times, Sir John and Mr Blair - former Conservative and Labour prime ministers respectively - said the government's actions were "irresponsible, wrong in principle and dangerous in practice".

Tony Blair and Sir John Major say Boris Johnson knew the full consequences of the Brexit divorce deal he struck it with Brussels last year - that new barriers to trade would arise between Northern Ireland and the rest of the UK.

The EU has warned the UK it could face legal action if it does not ditch controversial elements of the Internal Market Bill by the end of the month

Writing in the Sunday Telegraph, the Labour leader said his party could back the Internal Market Bill if the government addressed "the substantial cross-party concerns that have been raised"