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Federal prosecutors have accused Donald Trump’s former campaign manager Paul Manafort of attempting to tamper with witnesses in his federal tax and lobbying case.

In court documents Robert Mueller said Mr Manafort has tried to contact witnesses by phone and via an encrypted messaging service.

Special Counsel prosecutors say Mr Manafort was "attempting to tamper with potential witnesses while on pretrial release and, accordingly, has violated the conditions of his release”.

Prosecutors said Mr Manafort has broken violations of his release while he awaits trial.

They have asked federal judges to revise or revoke his terms of release meaning the President’s former campaign manager could face imprisonment until his trial.