What would you prefer him to say?
What he really thinks, and what he would really do if he were President.
He probably couldn't answer because he doesn't know which way the wind will be blowing then.
Article IV, Section 4 of the U. S. Constitution reads:
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
My read of this doesn't include the words "shall facilitate". It does include "shall protect against".
The Presidential Oath
I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States.
If you do not enforce Article IV, Section 4, you in effect nullifying part of the U. S. Constitution. You are not preserving, protecting, or defending it.