How do I know Trump is not a Russian agent?
How do I know the 0bummer wasn't a Russian agent?
Or Hillary or the socialist Bernie?
The person least likely of the above to be a Russian agent is President Trump. That is because President Trump is not socialist/communist. So, has no ideological reason to be a Russian agent. No sex scandal (it it had occurred ) could be able to ruffle President Trump's feathers. He would laugh it off. President Trump has always been wealthy and successful. President Trump is surrounded by people who don't like the Russians and are hard core patriots (unlike 0bama). For example, he picked General "Mad Dog" Mattis as secretary of defense and picked General Kelly as his chief of staff. President Trump's actions are not anti-Russian. Instead, they are pro-American. As a side effect of his policies though, Russian interests will suffer far more than they did under 0bama.
On the other hand, Bernie is a socialist and has indicated that he believes in the Chinese and Russian form of government more than our own. Hillary is corrupt and was amassing huge amounts of money the large majority from Russians. They went from dead broke to having more than $100 million (not including the Clinton Foundation slush fund).
The 0bummer lived in many countries as a child. He was around marxists and could easily have been recruited. (Note, I don't think Hillary, Bernie, 0bummer or President Trump is an Russian agent - it is just a simple fact that Hillary, Bernie and the 0bummer are more likely than President Trump to be Russian agents). Note, if Trump were a Russian agent, the Russians would not have been involved in very "clumsy" campaign shenanigans. Especially shenanigans that could be traced back to Russia.
BTW, I know more about science and how to do it than someone like you, I'm not religious and consider myself to be an ethical person. I'm a patriot and like almost all of the male members of my family, I gave up time to be in the military and served honorably my term of service.