The FBI and Department of Justice are under scrutiny for applying a double standard of justice to their political enemies and prematurely closing investigations — specifically into Hunter Biden — that could yield information that would hurt their preferred political outcomes.

In a scathing letter addressed to Attorney General Merrick Garland and FBI Director Christopher Wray on Monday, Republican Sen. Chuck Grassley detailed how partisanship has long tainted how the FBI and DOJ conduct their investigations.