A Senate oversight committee is demanding answers about new reports that key FBI officials investigating Hillary Rodham Clinton’s improper email server were biased in her favor -- and very anti-Trump.

Senate Homeland Security and Governmental Affairs Committee Chairman Ron Johnson has asked for some 10,000 texts sent between two agents involved in the email server and Russian election interference probes.

In his letter to Deputy Attorney General Rod Rosenstein, Johnson also raised the issue of the pro-Clinton and anti-Trump bias of the FBI officials, Peter Strzok and Lisa Page.

“I understand the Department of Justice (DOJ) is reviewing thousands of electronic text messages sent and received by Federal Bureau of Investigation (FBI) employees Peter Strzok and Lisa Page for production to Congress. These text messages exchanged between Strzok and Page reportedly ‘expressed anti-Trump political views.’ I write to seek more information about your awareness of these text messages and what actions, if any, you took in response,” wrote Johnson.

Strzok has been credited with watering down FBI Director James Comey's description of Clinton’s system. And he was fired recently for exchanging the texts with lawyer Page that seemed to mock Trump.

Johnson, who is also pressing the Justice inspector general in a letter posted below, added in his letter to Rosenstein, seen here:

“Strzok reportedly ‘helped lead’ the FBI’s investigation into former Secretary of State Hillary Clinton’s handling of classified information through her use of a private email server. During the FBI’s investigation of Secretary Clinton, Strzok participated in interviews of Clinton, Huma Abedin, Cheryl Mills, Heather Samuelson, and Jake Sullivan. In addition, Strzok reportedly edited then-FBI Director James Comey’s statement about Secretary Clinton, changing the description of her actions from ‘grossly negligent’ to ‘extremely careless.’

“After you tapped Robert Mueller as special counsel to examine potential Russian interference in the 2016 election, Strzok reportedly began ‘play[ing] a major role’ in the investigation. Mueller removed Strzok from the investigation after becoming aware of the text message allegations.”

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at pbedard@washingtonexaminer.com