The bill is expected to receive Royal Assent and become law on Tuesday. The prime minister must invoke Article 50, which formally starts the Brexit process. On the other side, Downing Street sources have said this will not happen this week and the PM is expected to wait until the end of the month. “We are now on the threshold of the most important negotiation for our country in a generation,” Brexit Secretary David Davis said. Brexit campaigners welcomed the “clear mandate” given to the UK government. Labour leader Jeremy Corbyn said the opposition would continue to press for the rights of EU nationals to be prioritised and for the maximum parliamentary oversight of the process. The Brexit the most traumatic event in the history of a union whose origins date to the 1950s. However, the Scottish first minister Nicola Sturgeon has confirmed she will ask for permission to hold a second referendum on Scottish independence, needed to protect Scottish interests in the wake of the UK voting to leave the EU. Prime Minister Theresa May has so far avoided saying whether or not she would grant permission.