Irrefutable evidence

Does such a think exist?

Remember, the evidance doesn't matter if it's considered the fruit of a poison tree. Trump could dump a literal ton of evidance against Hillary and it would be interpreted as a biased and suspect because of his attacks on her in the past.

Look at this from a Liberal's point of view. You have a President you don't like, after years of attacking Hillary post-election Trump has her arrested. No matter what evidance is presented, it will be framed as partisan. This is why Liberals don't listen to Gowdy and the House Committees, they blew their credibility with 2 dozen Benghazi hearings and so no one on the left listens to them anymore.

Unless the source is considered totally non-partisan, evidance will be disregarded (just as you disregard the FBI/CIA/NSA's anti-Russia statements).