We have a government spending trillions of dollars with plans to spend more and he suggests spending billions more on space travel? The real solution is to eliminate the regulatory barriers to private space travel and sell off NASA to interested private parties. The Moon might not be their first priority, but we would have a much more vibrant space program and the costs for larger missions would drop dramatically.
Imagine if China landed the first Moon Base in 2020 and was wellestablished there before the US even landed another astronaut. Highly unlikely BUT the fear is there - and with that fear comes the other one; strategic habitation of the Moon establishes something of a superiority over other countries.
Summary: the US govt. will guard NASA as long as it can. It can use it to make sure that it holds onto much of the tech (or at least controls who makes it).