Establishes funds for state border security and criminal alien prosecution and detention.

The State Border Security Assistance Act establishes the State Border Security Reinforcement Fund and the State Criminal Alien Prosecution and Detention Fund. The Secretary of Homeland Security and the Attorney General, respectively, use these funds to provide grants to states, state agencies, and local governments for specific border security and criminal alien prosecution and detention activities. The funds will terminate on January 20, 2029, with any remaining amounts returned to the Treasury for deficit reduction purposes.

Establishes funds for state border security and criminal alien prosecution and detention.

The State Border Security Assistance Act establishes the State Border Security Reinforcement Fund and the State Criminal Alien Prosecution and Detention Fund. The Secretary of Homeland Security and the Attorney General, respectively, use these funds to provide grants to states, state agencies, and local governments for specific border security and criminal alien prosecution and detention activities. The funds will terminate on January 20, 2029, with any remaining amounts returned to the Treasury for deficit reduction purposes.