Impoundment means that the president puts aside or refuses to spend the money congress has appropriated for a certain purpose. for example, in 1803, president jefferson refused to spend money set aside for new gunboats until a less-costly design could be built.

It seems that you have missed the necessary details for us to answer this question, so I had to look for it. Anyway, based on the given scenario above, this action is an illustration of a presidential role is CHIEF EXECUTIVE. Hope this answers your question. Have a great day!