Presidential Power of Impoundment

I received a link to a video by The Epoch Times discussing a little known constitutional concept known as “impoundment.”In short, the question on the table is, “Is the President of the United States (Executive Branch) required to spend every penny appropriated by Congress for a particular item provided by law.” According to the video, President Donald J. Trump states that when he returns to office, should he win the 2024 Election, he plans to resurrect the Presidential Power of Impoundment.