A bombshell letter from Wisconsin Republican Sen.Ron Johnson’s office reveals explosive claims of FBI misconduct over the handling of Hunter Biden’s laptop, Radar has learned. Johnson came forward with some concerns that were flagged by whistleblowers to DOJ Inspector General Michael Horowitz on Tuesday. “Recently, my office heard from individuals with knowledge of the FBI’s apparent corruption,” his letter stated, RadarOnline.com can confirm. After the FBI obtained the aforementioned laptop from the Wilmington, Delaware, computer shop, whistleblowers claimed that local bureau leadership urged…