The connection between Trump's campaign and Russia is the story that could bring Trump down - if collusion can be demonstrated. The linked article is interesting in that it mentions business fronts being investigated, but I found this snippet most significant:
"The people who spoke to Reuters also corroborated a Tuesday New York Times report that Americans with ties to Trump or his campaign had repeated contacts with current and former Russian intelligence officers before the November election. Those alleged contacts are among the topics of the FBI counterintelligence investigation."
http://mobile.reuters.com/article/idUSKBN15X0OE
"The people who spoke to Reuters also corroborated a Tuesday New York Times report that Americans with ties to Trump or his campaign had repeated contacts with current and former Russian intelligence officers before the November election. Those alleged contacts are among the topics of the FBI counterintelligence investigation."
http://mobile.reuters.com/article/idUSKBN15X0OE
