Morgan, who has steadfastly denied knowledge of phone hacking by his staff while he was editor of the two tabloids, has been under scrutiny since the scandal broke over the summer.
Back in July, British political blogger Paul Staines, who blogs under the name Guido Fawkes, claimed to have discovered a 2009 recording where some interpret Morgan as admitting knowledge of hacking and other unsavory activities by Murdoch journalists.
Morgan asserted that there was "no contradiction" between his 2009 comments to BBC radio host Kirsty Young and his "unequivocal statements with regard to phone-hacking."
"Millions of people heard these comments when I first made them in 2009 on one of the BBC's longest-running radio shows, and none deduced that I was admitting to, or condoning illegal reporting activity," Morgan said in a statement to ABCNews.com in July. "Kirsty asked me a fairly lengthy question about how I felt dealing with people operating at the sharp end of investigative journalism. My answer was not specific to any of the numerous examples she gave, but a general observation about tabloid newspaper reporters and private investigators."
The former Fleet Street editor has also fought off accusations from James Hipwell, a former Daily Mirror financial columnist who called illegal phone hacking "endemic" during Morgan's tenure. Hipwell is scheduled to testify Wednesday before the inquiry.
"Piers was extremely hands-on as an editor," Hipwell told British newspaper The Independent in July. "I can't say 100 percent that he knew about it. But it was inconceivable he didn't."