The precise wording, and the legal citation for the source is as follows:
"All laws which are repugnant to the Constitution are null and void."
--United States Supreme Court, in ruling Marbury vs Madison, 5 US (2 Cranch) 137, 174, 176, (1803)
Thanks for the correction.
However the lefties don't find violations of the constitution repugnant. Hence all the unconstitutional gun control laws as well as the recent eminent domain and campaign finance laws.
So as far as they see anything goes as long as it doesn't bother them.