By buying politicians and admitting that's what he does and that's how it all works?
Trump is trying to change how it works.
He’s compromised his principles the same way Mitt Romeny compromised his by flip flopping, although Donald is way worse than Romney in doing this over the years. He has gratuitously changed political positions on the key issues from socialized medicine (he still likes some forms of it), to gay marriage (although he says we should move on), gun control, abortion, social security and his praise of both the Clinton and Bush family. The man has no principles because he’s always changing his spots to adapt to the political climate that suits him. How can we trust Trump to be what he claims to be when he is known to constantly evolve his positions from the left to the right and back again?