at center of IRS whistleblower's bombshell claim the Biden administration thwarted and interfered with Hunter Biden criminal probe

Attorney General Merrick Garland is the 'senior' unnamed Biden administration official in the center of a new bombshell IRS whistleblower claim, a source familiar tells DailMail.com.

According to a letter Wednesday from attorney Mark Lytle, a man serving as a supervising agent on a 'high-profile' criminal tax probe has come forward seeking whistleblower protections while claiming politics are 'improperly infecting decisions' in an investigation.

The investigation referred to is reportedly examining matters related to President Biden's son Hunter Biden.