Sen. Chuck Grassley, R-Iowa, claimed Monday that the Biden administration's FBI targeted eight Republican senators as part of an election-related investigation, calling it "worse than Watergate."

In a post on X, Grassley shared what he described as a bureau document showing FBI agents conducted toll record analysis — a form of communications metadata review — on several GOP lawmakers, including Sens. Lindsey Graham, Josh Hawley, Ron Johnson, and Marsha Blackburn.

The analysis was part of "Arctic Frost," an investigation into alleged election conspiracy activity that Grassley says later evolved into special counsel Jack Smith's elector case against former President Donald Trump.

"This document shows the Biden FBI spied on eight of my Republican Senate colleagues,” Grassley wrote, accusing the bureau of politicizing its investigative powers. "Biden FBI weaponization = worse than Watergate."

The revelation is likely to intensify Republican criticism of federal law enforcement and fuel calls for congressional investigations into the scope and legality of surveillance targeting sitting lawmakers. The FBI has not publicly commented on the alleged probe.