@oralloy,
There are plenty of reasons to suspect it. Trump's own son said that most of the money the family business had came from Russia. In 2008, at the height of the real estate crash, Trump sold his palatial Florida house-not Mar-A-Largo-for the highest amount ever sold in Florida. Who did he sell the house to? A Russian oligarch, who never even visited the house, and had the house destroyed right after he bought it and parted out into three parcels. Made no sense. When business deals make no sense, there is usually some kind of payoff going on.
Don't forget that ever since the 2016 campaign, Trump has been trying to get permission to build a Trump Tower in Moscow, and he is awaiting Putin's decision, which if he gets it he gets a lot of money. Conflict of interest right there.
And the list goes on.