Yes, there is.
It's called a law.
Think about it.
There is nothing in the law that repealed Article 1, Section 8, "To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;
Or.. Article 1, Section 9, The privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it.
Or.. Article 4 Section 4, The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion;
Now, if you believe that what is going on down on the border is ANYTHING other than in invasion by infiltration you have not been where I have. Because brother, they are coming across at about 3000 to 5000 per day and the numbers are going up not down.
What are they going to wind up doing other than being the new 21 century slaves? Listening to the likes of La Raza and Mecha, thats what.
You better believe the uS Government has the authority to deploy troops on the border.