In a letter sent to FBI Director Christopher Wray on Thursday, Senate Judiciary Committee chairman Charles E. Grassley (R-IA) demanded to know if the FBI refused to charge Hillary Clinton because agents Peter Strzok and Lisa Page committed similar crimes.

Grassley raises the prospect that Strzok and Page could have engaged in the “alienation or destruction of federal records,” and asked Wray if the agents’ handling of federal records using private communications may have motivated them to shy away from finding evidence of Hillary Clinton engaging in similar acts.

Grassley’s letter reads:

In addition, I have raised concerns in multiple letters to the FBI about whether the FBI’s investigation was improperly narrow, focusing only on issues related to classified information, and not considering the alienation or destruction of federal records, whether classified or not, which is a crime under 18 U.S.C. § 2071.15 On April 10, 2016 and on June 3, 2017, respectively, Strzok said the following to Page: TRENDING: Black Lives Matter Activist Wearing 'Justice for Breonna Taylor' Shirt Walked into a Louisville Bar and Murdered Three People Gmailed you two drafts of what I’m thinking of sending Bill, would appreciate your thoughts. Second (more recent) is updated so you can skip the first.16 … Type on home computer and email to yourself.17 Additionally, in many messages they refer to related conversations they were having via iMessage, presumably on their personal Apple devices. It appears that Strzok and Page transmitted federal records pertaining to the Clinton investigation on private, non-government services. It is important to determine whether their own similar conduct was a factor in not focusing on and developing evidence of similar violations by Secretary Clinton and her aides.

In what was a major blow to Mueller’s investigation into alleged Russian interference in the 2016 presidential election, the special counsel was forced to fire Strzok after anti-Trump text messages were discovered.

New York Times reports:

The agent, Peter Strzok, is considered one of the most experienced and trusted F.B.I. counterintelligence investigators. He helped lead the investigation into whether Hillary Clinton mishandled classified information on her private email account, and then played a major role in the investigation into links between President Trump’s campaign and Russia. But Mr. Strzok was reassigned this summer from Mr. Mueller’s investigation to the F.B.I.’s human resources department, where he has been stationed since.

In a statement to the New York Times, Strzok’s lawyer said ”we are aware of the allegation and are taking any and all appropriate steps.”