There are two large ways to reduce OA to federally funded research

"There are two large ways that the Trump administration and Republican Congress could reduce the number of OA publications arising from federally funded research. First, Trump could require federal funding agencies to drop or dilute their OA policies. Second, Congress could cut their budgets, reducing the amount of research they could fund. Or both.

So far there's no sign of the first danger materializing. (I'll do my best to keep you posted.) But there are now signs of the second...."