Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) wants to subpoena former FBI director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and Loretta Lynch, who served as attorney general in the Obama administration.

Grassley would like to question the pair about a critical report released last week by the Department of Justice's (DOJ) inspector general that scrutinized the FBI's handling of the investigation into Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's use of a private email server while secretary of State.

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At a Judiciary Committee hearing earlier this week, Grassley criticized Comey and Lynch for not appearing before his panel. Grassley said Comey's attorney told him that the former FBI chief was out of the country "although I saw he was in Iowa over the weekend. According to his Twitter feed, he seems to be having a wonderful time."

During an interview for C-SPAN's "Newsmakers" show set to be aired Friday, Grassley said, "I want to subpoena [Comey and Lynch]."

Grassley noted that under the rules of the Judiciary Committee, the chairman and the ranking member – Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE (D-Calif.) – must both agree on the use of subpoenas.

Pressed on the timing of the possible subpoenas, Grassley laughed and said, "If Sen. Feinstein told me yesterday that she would do it, we'll do it."

The DOJ inspector general report was critical of both Lynch and Comey's handling of the FBI investigation into Clinton's emails, finding that agency protocol was broken.

• Special counsel probe on Russia. Asked whether it's time for special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE to wrap up his investigation, Grassley said the probe findings shouldn't be released soon before the election: "I think Mueller would be the type of person professionally either gets this done by Labor Day or else it'll come in November or December or January. I don't think he should do it -- for sure don't do it the month of October."

• Top DOJ officials. While some Republicans are clamoring for President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE to oust Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, Grassley said he has confidence in both DOJ officials as well as Mueller.

• Trade. Grassley acknowledged GOP frustration with Trump on his trade policies, saying he understands the president is trying to get better agreements with other countries. The Iowa senator, who said he talks to Trump about twice a month, said "it's a big gamble" that could net big wins for the country or "go over the brink" and be "catastrophic."

• Prison reform. There is pressure on the Senate to pass a prison reform bill, but Senate Republicans are split on whether to pass the House-passed bill or vote on a more comprehensive measure that includes sentencing reform. Grassley favors the latter and indicated there hasn't been much progress made on a compromise, though expressed optimism legislation could pass this year.

• EPA chief's future. Grassley stopped short of saying embattled EPA chief Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE should resign in the wake of various ethics controversies. The allegations "don't sound very good" and "are disturbing," Grassley said, adding he wants to wait until all of the investigations on Pruitt are completed before making an assessment.

• Supreme Court resignation? Grassley said he has heard "the usual rumors" about a possible retirement on the high court. "I have not had any confirmation -- I've tried to get some type of confirmation -- and I can't get it," the 84-year-old senator said with a chuckle. Any Supreme Court nomination would be tackled by Grassley's panel.

The interview will air on C-SPAN at 10 p.m. ET on Friday and at 10 a.m. and 6 p.m. on Sunday.