WASHINGTON -- House Democrats renewed their effort to force former White House aide Karl Rove to testify in a probe into Justice Department controversies, presenting a challenge to President Barack Obama, who will have to decide whether to defend his predecessor's legal arguments.

Michigan Rep. John Conyers, Democratic chairman of the House Judiciary Committee, on Monday issued a subpoena to Mr. Rove, seeking his appearance at a deposition Feb. 2. Mr. Conyers wants the former aide to President George W. Bush to answer questions...