Final answer:
A president might issue a signing statement to clarify their interpretation of the legislation and express constitutional concerns.
Step-by-step explanation:
A president might issue a signing statement for two main reasons. First, a president may issue a signing statement to clarify their interpretation of the legislation they are signing and how they intend to enforce it. This allows the president to provide additional guidance to the executive branch and ensure consistent implementation of the law. Second, a president might issue a signing statement to express any constitutional concerns with the legislation, such as if they believe certain provisions infringe on their executive powers.