Going back to Bill Clinton, started by Newt Gingrich, the Republicans only obstruct when a Democrat is President. They have no policy except against whatever the D president wants. Gingrich shut down government, impeached for a lie about a bj, congressional committees designed to only harass (whitewater, vince foster, etc, all leading to nowhere). Obama had the tea party, and the heaps of investigations (fast and furious, IRS, Benghazi) all leading nowhere. The Republicans will do the same to Biden if they take control of congress. Simple stop the Ds from doing anything. Say whatever no matter how hypocritical (remember how deficits mattered, but didn't when Trump was prez).
In contrast Democrat investigations lead to indictments and convictions (Scooter Libby, Mueller, etc) .