The Conservatives have unveiled their candidate to fight the Ealing Southall by-election on 19 July.
Businessman Tony Lit has spent the past 10 years running local radio station Sunrise and is involved in regeneration projects in the area.
The by-election was triggered by the death of Britain's oldest MP Piara Khabra, who was 82.
A by-election will be held in Sedgefield on the same day triggered by the retirement of Tony Blair.
During a visit to the constituency, Mr Cameron said Mr Lit was an "outstanding" candidate.
Mr Lit, who is also director of the Asian Lifestyle Show and the not-for-profit regeneration body Heathrow City Partnership, said: "Under David Cameron's leadership this is a party that recognises people from all backgrounds."
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