Even with unified GOP control of Washington, the president-elect's priorities may have trouble getting through Congress.

And in some cases Republicans themselves might be the barrier.

Building a border wall and restricting immigration from terror-stricken nations? Don't count on Senate Democrats to go along, and they will effectively wield veto power in many cases.

Repealing President Barack Obama's health care law? That looks likely to happen in some way, shape or form, but a number of states that accepted that law's expansion of the Medicaid health program for the poor are represented by Republicans. It will take painstaking and potentially lengthy negotiations to come up with a solution.

And then there are Trump's protectionist views on trade, skepticism about international treaty organizations and promises to protect Social Security and Medicare.