Article I Section 8 of the Constitution grants exclusively to Congress the function of calling up the State Militias.
"The Congress shall have power ... To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;"
The President's responsibility in case of the mobilization of the State Militias by Congress is defined in Article II Section 2:
"The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States;"
Note that the President does not have the Constitutional Authority to mobilize State militias. Only the Congress does. Furthermore, Congress may mobilize State militias only "to execute the Laws of the Union, suppress Insurrections and repel Invasions."
Congress does not have the authority to mobilize the State militias to act as nurses in a foreign land. And the President does not have the authority to mobilize the State militias at all!
If the President exceeds (once more) his authority, or if he succeeds in procuring Congressional complicity in this nefarious plot, the Governors of the several States must adamantly refuse to relinquish their authority over their State militias. Not only do they have the Constitutional right to do so, they have the responsibility to protect the members of their militias against the reckless and wanton exposure to deadly diseases in a foreign country – a country that is of no strategic interest to the security of the United States or its citizens.
We must stand together as the United Sovereign States of America against a president who has publicly stated that he perceives it to be his responsibility to put the welfare of the people of his birth land above the best interests of the citizens of the United States of America. We cannot allow our State Militias to be sacrificed to bolster the nationalistic sympathies of a foreign president.