It is dictatorial, not because one person gets to make the decision, but because the US constitution delineates the powers of the gov't, to which the President does not have this power. I really do not understand why this is such a hard concept for many people here to grasp. The separation of powers is such a fundamental aspect of our government that I am astounded to see you miss this point. When any one branch usurps the power of another branch it is the *EXACT* kind of tyranny the constitution was created to avoid.
What was happening before this year? Surely, congress was not the one approving and awarding these grants. It was a member of the executive agency. Trump didn't declare any power that wasn't already being exercised by the executive.