Yes, the Russians are trying to use Donald Trump to infiltrate America. They know that Trump will do whatever they ask of him, and they will use his presidency to have control over American politics. They want to be the world's most powerful country, and they think Trump will let them be.
It seems a little fishy to me. First Lewandowsky has financial ties to Ukranian groups associated with Russia, then Ivanka vacations with Putin's girlfriend. Then Donald says he approves of Putin, but Pence doesn't. Then Trump complains that the election is rigged so Russia asks to "help" monitor it. Maybe it's not a full-blown conspiracy, but it's certainly suspicious.
The Russians are trying to use Donald Trump to infiltrate America. They are doing this by painting Trump as a tough guy whom they are ready to work with to end terror. For a long time Russia has claimed that the Obama administration has in one way or the other supported rebels like ISIS who later transform into terror groups.
No, I do not believe that the Russians are using Donald Trump to infiltrate America. Hillary Clinton has run out of good reasons to make Donald Trump look bad so the Democrats are making up non-sense about Russia and Donald Trump working together. This is just another attempt from the Democrats to try and divert attention from all of Hillary Clinton's crimes.