(AP) – A British opposition lawmaker says Parliament should stop the “madness” Iand overturn the result of a referendum calling for Britain to leave the European Union.

Labour legislator David Lammy says Thursday’s national vote was non-binding and “our sovereign Parliament needs to now vote on whether we should quit the EU.”

Wake up. We do not have to do this. We can stop this madness through a vote in Parliament. My statement below pic.twitter.com/V8f9Yo1TZd — David Lammy (@DavidLammy) June 25, 2016

He says some “leave” supporters now regret their votes and Parliament should vote on Britain’s EU membership. He said “we can stop this madness and bring this nightmare to an end. … Let us not destroy our economy on the basis of lies and the hubris of (‘leave’ leader) Boris Johnson.”

Constitutional experts say Parliament cannot easily ignore the will of the people. Alan Renwick, deputy director of University College London’s Constitution Unit, says “in legal theory that is possible. In practice, that is absolutely not possible.”