I backed my statement with the Constitution.
Now, back yours.
OK. You demonstrated the method upon which money is drawn from the Treasury, now demonstrate the authority to expend that money on foreign disaster relief. Article 1, Section 9, Clause 7 does not exist in a vacuum nor does it grant any authority. To assist you, I'll refer you to Article 1, Section 8 for the list of specific powers delegated to Congress. Similarly, I'll refer you to Article 2, Section 2 for the list of specific powers delegated to the President. Now, I'll ask you, if either the Congress or the President has any additional powers, where did they get them?