During a presidential primary and campaign in the months leading up to a presidential election, any member of Congress who is a CANDIDATE FOR THE OPPOSING PARTY should be required to RECUSE themselves from any matters in either the House or Senate that concern investigating a first-term PRESIDENT who is seeking reelection.

Because of their position of power in congressional oversight, it is a conflict of interest if they sit on committees, speak on the Floor, or are involved in any matters of investigation of their opponent. It's in the Democrat candidates' best interests politically to make their opponent look as bad as possible, so it's obvious they won't be impartial regarding the president (in this case Mr. Trump). This allows them to weaponize their positions unfairly against him.