If you consider illegal immigration as an "invasion", then it's the President's duty to protect the country from it.
"WASHINGTON, DC—Today, Congressman Jodey Arrington (TX-19) introduced a resolution affirming Article I Section 10 of the U.S. Constitution, which recognizes states’ sovereign power to defend themselves against invasion. In response to President Biden’s open-border policies, the federal government’s failure to respond, and the subsequent opportunism by the cartels, Rep. Arrington implores southern border states to use their constitutional power to defend themselves against the cartel-facilitated invasions and protect their citizens.
“The Constitution is clear: Section IV Article 4 says the federal government “shall protect each of [the states] against Invasion,” said Rep. Arrington. “When the federal government fails to fulfill this constitutional duty, Article 1 Section 10 expressly guarantees states the sovereign power to repel an invasion and defend their citizenry from overwhelming and “imminent danger.” This resolution affirms that states don’t have to be passive victims of this Administration’s border security failures; rather, they should exercise their sovereign, constitutional right to defend themselves and their citizens.”
“No ifs, ands or buts—the Biden Administration is failing to secure our southern border,” said Rep. Brian Babin (TX-36). “The Constitution says clearly that states have the power and right to step in and defend themselves when the federal government won’t do so. I’m proud to support Rep. Arrington’s resolution that will finally take power away from the deadly cartels and put it back into the hands of American citizens as we fight in the war for our safety and sovereignty.”
“The Biden administration abandoned its duty to the rule of law, our national boundaries and Americans’ security,” said Rep. Jim Banks, Republican Study Committee Ranking Member. “It’s negligence, and states have a duty to protect their residents if the White House won’t."
“Drug cartels’ vicious attacks and trafficking at our southern border continue to undermine the stability of Texas and, most importantly, the safety of our citizens,” said Texas State Senator Charles Perry. “I’ve drafted a resolution encouraging state agencies to use their resources to repel the drug cartel invasion, including those of the Texas Military Department as allowed by the U.S. Constitution. I want to thank Congressman Arrington for his efforts to address this very important issue at the federal level.""
Arrington Fights to Safeguard States’ Rights to Defend Against Border Invasion