The Democrats lost the election, and they were told to pack up. Joe Biden and others got angry, and began a campaign to derail the incoming Trump administration by pulling the rug from out under Gen Flynn. His job involved liasing with foreign leaders, which was portrayed by Biden as a violation of the Logan Act. This was fed to the press as a reality, in the same way P. Trump was supposedly involved in a quid pro quo with the Ukraine.
Biden's behavior was unpatriotic, and deceptive. This is to say nothing of his influence peddling in the Ukraine which was about to change- you know that is what really pissed him off. He engaged in a campaign to fowl up P Trump's foreign policy by improperly eavesdropping on Gen Flynn.
He ought to be asked about this. He did not respect our nation, and did not assist is making the transition smooth. Rather he attempted to derail the incoming administration, placing himself above our nation's interests.