Mr Cameron left the BBC to launch his party’s conference at the ICC A protest is to be held in Birmingham against public spending cuts as the Conservative conference gets under way in the city.
Initiated by the Right to Work Campaign, it is backed by trade unions and the Labour Representation Committee, a spokesman said.
Organisers say they are angry at not being allowed to march past the ICC, where the conference is taking place.
West Midlands Police was not available immediately to comment on security.
However, a Conservative spokesman said they had a right to peaceful protest.
The protesters said they were frustrated at not being able to march near the conference venue.
“We feel that this is a violation of the right to freedom of speech and our rights to protest peacefully against the government,” a spokesman said.
“Peaceful protest is a vital part of a democratic society and people have taken their opposition to Government actions to their conferences for decades.”
In a statement, a spokesman for the Conservative party said: “Everybody has the right to peaceful protest.
“Birmingham is a welcoming city for all – regardless of their political views.”
Opponents of the new high-speed rail link are also joining the protest.
Stop HS2 campaigner Lizzy Williams is to walk the branch line into Birmingham to coincide with her arrival at the protest march through part of the city centre.
The proposed railway route was announced in March and is scheduled to go from London’s Euston Station, to just south of Aylesbury, up to between Coventry and Kenilworth, and then into a new station in the Eastside area of Birmingham.
But some residents in Warwickshire, Staffordshire, Northamptonshire and Buckinghamshire are against the scheme.
Ms Williams has been walking the route throughout September meeting other campaigners along the way.
Ahead of the four-day Tory conference starting, the prime minister has urged people to put public spending cuts “into perspective”.
Chancellor George Osborne will outline the government’s plans on 20 October.
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