Who’s going to charge him with a crime? Iraq and Afghanistan both have the most to gain, but good luck getting the U.S. to extradite a former president to sit trial for a foreign power. The U.S. sits on the United Nations security council, so the U.N. can’t do anything. Realistically the only one who could charge him is the U.S. themself, but that would require a formal admission that the wars were unjust. Not to mention, we’re already struggling to arrest a former president who attempted a coup, and potential charges against Bush would be much more difficult.