Former Prime Minister Gordon Brown gives evidence at the Leveson Inquiry into press standards on Monday.
The Labour MP will appear at a hearing in London the same day as current chancellor George Osborne is scheduled to do so.
Mr Brown is expected to face questions about his relationship with News International while in office.
The Kirkcaldy representative was Prime Minister for just under three years having succeeded Tony Blair in 2007 until Labour lost the May 2010 General Election.
Since the phone hacking scandal first broke, it emerged police were investigating whether the former PM was one of those targeted by private investigator Glenn Mulcaire, who worked on behalf of the News of the World.
Last year a spokeswoman for Mr Brown said: "Gordon Brown has now been informed of the scale of intrusion into his family's life. The family has been shocked by the level of criminality and the unethical means by which personal details have been obtained.
"The police have confirmed Mr Brown is on Glen Mulcaire's list."
News Corporation boss Rupert Murdoch told the inquiry earlier this year that the “unbalanced” Labour member declared war on his media empire after The Sun switched its support from Labour to the Conservatives in 2009. Mr Brown denied making such a threat.
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