Just off the top of my head, then, we're at:
Trump having a history of doing business (to the tune of tens if not hundreds of millions of dollars) with high net worth Russian individuals (some affiliated with the Putin government).
Manafort & Co, who have previously worked for the Russians, and who recommended taking Russian-critical language out of the party platform (while making no other major changes).
Ivanka going on vacation with a woman believed to be a personal and intimate friend of President Putin.
Russian intelligence groups stealing emails from the DNC. Trump openly asking Russian intelligence to publicly release email contents they had stolen, which they did.
Trump associates display knowledge of email contents prior to their being released.
Confirmed contacts between Trump campaign surrogates and supporters and Russian officials, with more such contacts alleged.
Trump's National Security Advisor having multiple, possibly illegal, contacts with high-ranking Russian officials, which he then attempted to conceal from the VP and others.
Trump's son-in-law was also present for a meeting between the NSA and the Russian Ambassador, with the Ambassador's presence being kept secret from the public.
Trump is allegedly being blackmailed by the Russian government.
Trump fires the DoJ official responsible for investigating his NSA's contacts with Russia.
Trump's Secretary of State has a long history of personal and business ties with Russia and Russian leadership.
Trump's Secretary of Commerce has a long history of business ties with Russia and Russian oligarchs.
Trump's Attorney General lied under oath to conceal his contact with the Russian Ambassador, and then lied again when explaining them.
Trump's administration fires State Dept officials advising his UN Ambassador how to stand up to Russian aggression.