The former UUP deputy leader John Taylor is being challenged to prove his claims at the Saville Inquiry that the Bloody Sunday civil rights march was a front for terrorists.
The peer was giving his second day of evidence to the tribunal. Taylor, now known as Lord Kilclooney, angered relatives of the dead and injured when he claimed that 13 gunmen were killed on the day.
He has been asked to produce documents to prove his claims that the Northern Ireland Civil Rights Association was a front for terrorists.