May 16, 2017
On Tuesday, May 16, 2017, the President signed into law:
H.R. 274, the "Modernizing Government Travel Act," which requires the General Services Administration to prescribe regulations to provide for the reimbursement for the use of a transportation network company or innovative mobility technology company by any Federal employee traveling on official business.
Donald J. Trump, President Donald J. Trump Signs H.R. 274 into Law Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/327626