Secret Service Prioritization Act of 2025 This bill transfers most investigative authorities of the U.S. Secret Service to the Federal Bureau of Investigation (FBI). Specifically, the bill transfers to the FBI the Secret Service's authority to investigate federal criminal offenses involving (1) certain misconduct in connection with government transportation requests, federal farm loans, and the Federal Deposit Insurance Corporation; (2) coins, obligations, and securities of the United States and foreign governments, including counterfeiting of U.S. currency; and (3) financial and computer-based crimes, including identity theft, electronic access fraud, computer fraud, and electronic benefits transfer fraud. Under the bill, the Secret Service retains the authority to investigate two categories of federal criminal offenses: (1) threats against the President, President-elect, Vice President, or Vice President-elect; and (2) threats against former Presidents and certain other persons.