If Congress or the President were truly concerned about the environment, there are several actions that can be taken immediately that are entirely within their purview.
One of the those actions is to prevent the ~490 ships in the U.S. Navy from dumping their waste and garbage into the ocean; something the Navy has been doing with impunity for 244 years.
All garbage generated by a Navy ship is collected in plastic bags (as one might expect), but then those plastic bags – full of plastic – are simply heaved over the side.
I presume all Navies – save those from perhaps the most conscientious European countries – do the same.