The House of Lords has been warned its existence will be put at risk if it attempts to block the Brexit bill, after MPs voted to pass it unamended.
The bill – to give the government the authority to trigger Article 50 – was approved by 494 votes to 122 in the Commons, and now moves to the Lords.
A government source said the Lords will face an “overwhelming” public call to be abolished if it opposes the bill.
Brexit Secretary David Davis called on peers to “do their patriotic duty”.
Prime Minister Theresa May wants to invoke Article 50 – the starting gun on the two-year process of the UK leaving the EU – by the end of March.
However, after a Supreme Court ruling last month, she first requires Parliament’s permission.