It's worth noting that the actual impact to NASA's budget is relatively small. Down to 19.1bn from 19.3bn.
Also worth noting: "Discretionary spending limits, addressed by this proposal, are set by congressional budget resolutions. Congress typically makes changes to the president’s proposal — last year, lawmakers disregarded Obama’s budget altogether. "
https://www.washingtonpost.com/graphics/politics/trump-presi...