The overwhelming approval by both chambers of the US Congress of a bill imposing new, permanent sanctions on Russia, Iran, and North Korea puts President Donald Trump in an impossible position. He can either sign the bill or allow it to become law without his signature, in which case he has acquiesced in the Legislative Branch’s usurpation of what is supposed to be among the Executive’s primary constitutional responsibilities, the conduct of relations with foreign states.
Or he can veto it, but with a total of only five votes against it in both the Senate and the House together, an override is almost certain. Trump would still find his authority curtailed, on top of crippling his clout during the infancy of his term.
http://ronpaulinstitute.org/archives/featured-articles/2017/july/29/bipartisanship-the-evil-party-and-stupid-party-team-up-to-cripple-trump-subvert-the-rule-of-law-and-put-the-us-on-a-road-to-war/
https://www.youtube.com/watch?v=Zw0Tpr6IaYQ