This was a terrible mistake on Biden's administration. Poland went to investigate politicians from the previous ruling party, and what would you know? Many were bought by Russians.
We need to go after corruption, Republicans, Democrats even SCOTUS. Corrupted politicians (no matter on which side he/she is) is a threat to democracy. We can't have strong institutions if corruption is allowed.
The policy Obama started of letting Republicans do whatever they want with an "Aww shucks, ya did it again didn't ya?" attitude whenever they break the rules is... quite literally going to get people killed.
Obama was incredibly "friendly" towards the worst amongst the Finance industry in how he chose to "rescue the Economy" by basically sacrificing everybody else to make them get away with minimal losses in the aftermath of the 2008 Crash.
Obama also made a ton of money in the speech circuit after that (he is very literally a multimillionaire) a lot of which paid directly and indirectly by Finance Industry companies.
That's not how this works. When Trumpers take any sort of action, it's good, when the same action is taken or not taken by anyone on the other side it's bad. How do Trump voters know which is which? Easy, Fox tells them, no need to think.
Corruption makes a lot of money for politicians on both sides of the aisle in America.
Democrats didn't go after Republican corruption because they too would be caught in the net if it was indeed done via an independent Justice System.
You see this exact same effect in other countries with voting systems that boost the representation of the two largest parties - neither of them ever goes after Corruption because both of them have been thoroughly captured by corrupt politicians and you even get the effect in Parliamentary systems that some of the few things they both vote together on is weakening existing anti-corruption legislation and defeating new anti-corruption legislation.
Parties which regularly get real power, such as the two main parties in Power Duopoly "democracies", always attract the most crooked people around (similarly to power monopolies - I.e autocracies) and are guaranted to turn rotten even when they start from the most honest and fair beginnings.