Quid pro quo. Trump campaign solicits help from Russia to hurt Clinton and aid Trump. We know about Don Jr's meeting, and Trump's own words, "Russia, I hope your listening...". What else was done that isn't yet public? Trump wins electoral college after Russian bots spread fake news in close states. Flynn then instructed by "high level official" to assure Russia that they shouldn't worry about new sanctions being imposed by Obama, which violates the Logan Act. Then as president Trump asks Comey to stop pursuing Flynn. Trump then fired an uncooperative Comey. Obstruction of justice. Trump then asks Republicans in Congress to back off investigation. And that's only what is known publicly to-date. Quid pro quo.