This genuinely terrifies me. The practical answer is not a damned thing. Congressional investigations are toothless affairs. The media would be hostile to anything turned up by a Republican-led investigation. The executive has the plenary power of pardons. The only thing left to the people would be massive and continued demonstrations and civil unrest, but that's not going to happen. So the Democrat lawlessness would not only continue, but be emboldened. I don't see any solutions if she wins the election.
In one of his speeches I listened to, Trump said (paraphrase) don't worry about me, it's you (the audience) who will be screwed. He is being honest. America will limp along with Hillary's crony capitalism, some crony capitalists will get a huge windfall, a percentage of that will go to the foundation and some will trickle down to the rest of us.
The world however is screwed. America used to be the country that saved the world. If Hillary gets in, we won't be able to save ourselves. The result will be a resurgence of communism and Islam (those two political systems work together). We will go Islamo-communist as well eventually.