John Yoo, a conservative law professor known for his views on presidential power, confirms he will advise a team investigating whether officials conspired against Donald Trump. Yoo will assist Joe diGenova, a former Justice Department prosecutor. Yoo, a law professor at UC Berkeley, was a senior Justice Department official in the George W. Bush administration. He authored memos justifying harsh interrogation techniques after 9/11. The investigation, conducted in Florida, focuses on the Russia probe and whether officials engaged in a conspiracy against Trump. The scope remains unclear, and no criminal charges have been announced.