Sir Denis O'Connor, outgoing HM Chief Inspector of Constabulary, will give evidence on Olympics security.
Stephen Greenhalgh, Deputy Mayor of London for Policing and Crime, will give evidence on policing in London.
Metropolitan Police Commissioner Bernard Hogan-Howe has also been asked to give oral evidence.
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The prominent Brexiteer says leaving the bloc will offer a "once in a lifetime" opportunity to set reform environment policies.
The Severn Crossing tolls will be abolished next year, the government has said. Currently cars are charged £6.70 for a return journey.
An Australian bride-to-be shot dead by a US officer after calling 911 "should not" have been killed, say police.