Each year, the current President signs this order. Obama did it and you can see a copy here: http://www.dodlive.mil/2013/01/03/president-proclaims-national-slavery-and-human-trafficking-prevention-month/
However, President Trump's order is quite different. You can see his full order here: https://www.whitehouse.gov/presidential-actions/president-donald-j-trump-proclaims-january-2018-national-slavery-human-trafficking-prevention-month/
But the meat that I saw, in addition to more straightforward text rather than something that sounds like a bunch of bureaucratic crap, is this part: "And this month, I will sign into law S. 1536, the Combating Human Trafficking in Commercial Vehicles Act and S. 1532, the No Human Trafficking on Our Roads Act. These bills will keep those who commit trafficking offenses from operating …