Who will police presidential conflicts of interest?

The 538 members of the Electoral College cast their votes today for a Commander-in-Chief with the most extensive potential conflicts of interest in the history of the presidency. Watchdogs say the law requires Donald Trump to sell off his holdings, but he's postponed addressing the issue until January, tweeting that his sons will run the business -- the same sons that are deeply involved in the Trump transition team. Democrats, led by Senator Elizabeth Warren, have vowed to hold Trump to the standard of a little known constitutional principle, the Emoluments Clause, claiming it gives grounds for impeachment if Trump doesn't fully divest himself of his holdings. Why are Republican voters seemingly unconcerned with the blurring of the lines between the Trump Organization and the White House? With a Republican controlled Congress who can hold the President accountable?