Call your Congressional Representative (find your Rep here) and let them know that you support, and would like them to support, Rep. Katherine Clark’s Presidential Accountability Act, which forces Presidents and Vice Presidents to address any financial conflicts of interests that they may have before taking office. This is an excellent move not just for ensuring that Donald Trump addresses his conflicts of interest, but also for fixing the existing loophole for Presidents regarding conflicts of interest (first created under George H.W. Bush) going forward.
You can also call house leadership at these numbers:
Paul Ryan: (202) 225-3031
Nancy Pelosi: (202) 225-4965