What evidence do they have?

he was seen putting russian dressing on a garden salad and media went nuts

Collusion is No Crime and the investigation has already concluded Trump was never involved in any Collusion, so this entire Waste of American assets is a Fraud. So, the entire "Investigation" is based on Corruption at the highest levels of the DOJ. the FBI and the DNC. It accurately fits the Definition of a Witch Hunt.

Any Lawful and Constitutional iuse of the Judicial Branch of Government must have evidence of a crime and then determine who committed the crime. Followed, of course, by appropriate prosecution.

In this case they never had a Crime. Collusion is no crime. They have a Target person (Donald Trump) and are Still, after 18 months, searching for a crime to charge him with. They looked at obstruction of justice but they have only found evidence of cooperation.

There is no Collusion. Time to shut down the investigation.

None, it's a witch hunt

So far nothing, but Collusion unto itself is not a crime.

When the investigation is concluded we will all know what if any collusion there was.

Or perhaps the Democrats could behave Republicans, as they treated Hillary Clinton, where as each of the 33 investigations she faced did not get the result they wanted, they started another one. Good grief it is still going on, instigated this time by President Trump.

The truth will come out, if Trump is innocent, why are Republicans not willing to wait for this to be proved?

This has become known as "The Russian Defence" as they use it on all occasions now.

Simply deny all evidence ,using even the most implausible and self contradictory reasons ,knowing that there are sufficient sycophants and idiots out there who are willing to swallow it .

Whenever a Russian opens their mouth -- they lie .

It really is that simple these days

0000000000000000

You are evidence that Russian trolls are still trying to sway public opinion by widening the fissures that are driving Americans apart.

Everyone knows that Trump colluded not with the Russians, but with those little blue men with seven noses, one eye and forty seven mouths from that planet that orbits Achird.