April 11, 2018
On Wednesday, April 11, 2018, the President signed into law:
H.R. 1865, the "Allow States and Victims to Fight Online Sex Trafficking Act of 2017," which makes it a Federal crime to own, manage, or operate a website with the intent to promote or facilitate prostitution.
Donald J. Trump, President Donald J. Trump Signs H.R. 1865 into Law Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/335901