You might want to read the email exchange.  When offered information from the Russian government, he responded with "I love it".  He didn't go to the FBI, he didn't go to the Secret Service, which is a law enforcement agency, that was protecting his dad, instead, he took the meeting, expecting to get information from a foreign power.  That pretty much seals the fact that he was wanting to work with the Russians, no matter how you try to spin it.