I believe this branch is the most powerful because the power is in the president. The president has the authority to veto laws, but he doesn't have full power because there are restrictions. As commander in chief, the president has the power to conduct diplomacy with foreign nations and to negotiate and sign treaties subject to Senate ratification. Additionally, the president can issue pardons for federal crimes. The executive branch is not all-powerful and is restricted in some significant ways. For example, although the president has the power to make appointments, including to the Supreme Court, his choices must be approved by the Senate.