And the President is supposed to act as a check
United States Constitution, Article II, Section 2, Clause 1
Well he takes an oath of office - I'm sure it's in there somewhere, let's see...
“I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the poor people and women and all the minorities and cripples and people in poor health that need decent health care and feed and clothe them and be really nice and not talk mean to anyone except the bad oil companies and those evil Wall Streeters (unless I put them in my cabinet)”
Yep, you're right!