Good comment on https://www.breitbart.com/politics/2019/02/15/washington-post-democrats-hid-their-border-security-wins-from-trump/
Wait for it. lol He has already spoken to the issue that though he signed it, parts are clearly unconstitutional and have no effect. He is right: "All laws which are repugnant to the Constitution are null and void." Marbury vs. Madison, 5 US (2 Cranch) 137, 174, 176, (1803) . He has already nullified parts of the law as being unconstitutional. He has just practiced a line item veto.
He's giving you the Civics lesson you never had in public school. Part of the process in re-establishing the rule of law, among a people who gladly give up their rights to not be offended, and give up their privacy for the convenience of chatting online is to educate them through the processes of law as he exercises them.
Congress cannot just pass anything they want. It is not just the Supreme Court that gets to decide. Defending the constitution is the responsibility of every one from whom the source of authority for government flows and whom unjust laws are foisted upon.
It is by it's nature, impossible for any law, from any source, to abrogate the supreme law of the land; the Constitution.