Former Democratic Unionist Party leader Sir Jeffrey Donaldson has pleaded not guilty to all 18 charges he faces as his sex abuse trial begins with jury selection.

The charges against Donaldson include one count of rape among other allegations. The former politician entered his plea as proceedings commenced in what is expected to be a closely watched trial.

Donaldson previously served as leader of the Democratic Unionist Party, Northern Ireland's largest unionist political party, before stepping down from the position. The DUP has been a significant force in Northern Irish politics and has played key roles in power-sharing arrangements at Stormont.

The trial is proceeding with standard jury selection procedures as the legal process moves forward. The court will hear evidence and testimony related to the charges as the case progresses through the judicial system.

No further details about the specific allegations or timeline of events have been disclosed as the trial enters its initial phases.