It's a counterintelligence investigation and it always was.

The word "collusion" has never appeared in any part of the investigation at the outset.
It was never an investigation into "collusion" because collusion is not a legal definition of a crime.
Obstruction and espionage, on the other hand, are.

The word "collusion" is a right wing straw man. Always has been.
The word collusion appears nowhere in the order authorizing Mueller’s investigation.
There isn't even a crime called “collusion.”
Mueller was ordered to investigate “any links and/or coordination between the Russian government and individuals associated with” the Trump campaign.

The purpose of the Mueller Investigation is to identify threats to our national security, potentially including the President of the United States and his associates.

I'll wait patiently for the President to tweet: "No obstruction!"

popcorn2
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The only people pushing the Athenian Straw Man Nonexistent Threat of Slippery Slope Windyfoggery (ASMNSSW) RE DEMOCRACY are people who have a misunderstanding/problem or hatred of democracy. (See AUTHORITARIANS)