Read your constitution it is the responsibility of the executive branch to act to protect us from an invasion.
True, but a State Legislature must Formally Declare an Invasion and then Demand the President enforce the border with the Military
No the president has authority to act unilaterally in defense of our country. This is an invasion he does not need approval to act in defense of an invading force. Mexico is not stopping this and is act of aggression. Please educate yourself on the constitution