Any Labour MP found to have made improper expenses claims will be ­automatically deselected and barred from standing at the next general election as the party desperately tries to overcome the constitutional crisis facing parliament.

The Guardian has learned that the ­radical proposal is expected to be agreed next week by Labour's national executive, a move that acknowledges the deep anger among voters to the escalating scandal over MPs' claims.

Gordon Brown has also given ministers a Monday night deadline to ensure their expenses claims for the past five years are lodged with the parliamentary authorities and ready for publication.

Any deselection would happen after the parliamentary commissioner for standards had ruled that an MP had been found clearly guilty of improperly claiming.