He has now been called in to testify in front of congress on it ... twice. However insignificant the dollar amount, knowing the details of it is his job.
Ultimately yes - but not at grant time, just like how a CEO is responsible for everything in a company either directly or indirectly. Shit flows up, he may not be personally involved in the decision but he absolutely has to be briefed on it (or know who to ask) if things go sideways so he can answer to Congress/President (just like a CEO to the board).
