LONDON (AP) — James Murdoch will be recalled for a second grilling before Britain’s Parliament, a senior lawmaker investigating the tabloid phone hacking scandal said yesterday.

The announcement from John Whittingdale, the chairman of Parliament’s media committee, comes after former Murdoch executives raised serious doubts about the credibility of the dramatic testimony given by James and his father Rupert, head of the News Corp. media empire.

A string of ex-News Corp. employees have cast doubt on several claims made by the father-and-son media magnates on July 19.

Specifically, former News of the World tabloid editor Colin Myler and former legal adviser Tom Crone insisted that James Murdoch was wrong when he claimed not to have been made aware of a critical piece of evidence suggesting that illegal espionage was far more widespread at the tabloid then was being claimed.

James Murdoch has stood by his testimony. A spokeswoman for News Corp., which the younger Murdoch serves as deputy chief operating officer, said that he was “happy to appear in front of the select committee to answer any further questions members might have.”

Whittingdale told Sky News television that his committee was “beginning to reach the end of its deliberations” but wanted to tie up “one or two loose ends” by recalling witnesses.