Washington: President Barack Obama is leaving the door to open to possible prosecution of Bush administration officials who devised harsh terrorism-era interrogation tactics.

He also said on Tuesday that he worries about the impact of high-intensity hearings on how detainees were treated under former President George W. Bush. But Obama did say, nevertheless, he could support a congressional investigation if it were conducted in a bipartisan way.

Obama has said he does not support charging CIA agents and interrogators who took part in waterboarding and other harsh interrogation tactics, acting on advice from superiors that such practices were legal. But he also said that it is up to the attorney general whether to prosecute Bush administration lawyers who wrote the memos approving these tactics.