Such sentences display such a weird understanding of how the federal government works. How can the administration “tighten its hold” over discretionary grants? These aren’t Congressional appropriations earmarked for specific projects. The administration is the only entity that can exercise control over these grants. It would actually be a huge problem if the administration didn’t have a tight hold on these funds. That would mean grants would be going out without close supervision by any elected officials (Congress or the President).
When people talk about "the Trump administration tightening its hold", they mean Trump and his political appointees exerting direct control over things that have a strong precedent for being out of their direct control.
Using the word "administration" to conflate the presidency with the layers of organization below it is the main premise of the "unitary executive theory", which is an extremely recent development of the current Supreme Court. Previously, when Congress said "such-and-such a decision is supposed to be made by the staff of agency XYZ, not by the President/Secretary personally", the courts assumed they meant it.