Well, this is both surprising and predictable: A new bill proposed by five duly elected Republican Congressmen: Text - H.R.193 - 115th Congress (2017-2018): American Sovereignty Restoration Act of 2017 | Congress.gov | Library of Congress. Excerpt (but you really should read the whole thing):
SEC. 9. REPEAL OF UNITED STATES PARTICIPATION IN THE WORLD HEALTH ORGANIZATION.
The joint resolution entitled “Joint Resolution providing for membership and participation by the United States in the World Health Organization and authorizing an appropriation therefor”, approved June 14, 1948 (22 U.S.C. 290), is repealed.