September 20, 2018
On Thursday, September 20, 2018, the President signed into law:
H.R. 6124, the "Tribal Social Security Fairness Act of 2018," which allows Indian tribes to enter into agreements with the Social Security Administration to provide Social Security and Medicare coverage for members of tribal councils.
Donald J. Trump (1st Term), President Donald J. Trump Signs H.R. 6124 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/336262