Boris Johnson has called for the organisers involved in Olympic security should be allowed to concentrate on the games rather than answer questions about the failings of G4S. He suggested any inquiry should be delayed until September.
A committee of MPs has said the problems with recruiting security staff for the Olympics should have been foreseen.
The boss of the government's Olympics' security contractor G4S has faced a dressing down from MPs for his firm's poor performance.
The head of G4S is under pressure to quit his £830,000-a-year job as he prepares to face questions from MPs