A pair of top House Republicans pushed the Justice Department on Monday to drill down on examples of alleged perjury that occurred when Hillary Clinton testified before the Select Committee on Benghazi in Oct. 2015.

Rep. Jason Chaffetz, chairman of the House Oversight Committee, and Rep. Bob Goodlatte, chairman of the House Judiciary Committee, described in a letter to the agency "four pieces of sworn testimony" that they described as "incompatible with the FBI's findings" about the former secretary of state's private email use.

Their letter came nearly two weeks after Peter Kadzik, an assistant attorney general, responded to a perjury referral made in July by stating in a brief note that the Justice Department is "reviewing" the allegations and would "take appropriate actions as necessary."

Chaffetz and Goodlatte cited Clinton's claim, made under oath during the Benghazi hearing and repeated frequently on the campaign trail, that she never sent or received any emails marked classified.

FBI Director James Comey testified before the Oversight Committee last month that at least three emails on Clinton's server bore classified markings and that more than 100 additional records should have been marked classified at the time they were written.

The committee chairmen noted a contradiction between Clinton's assertion that her legal team had read each individual email to ensure she turned over all work-related records and Comey's admission that the team relied on keyword searches to determine which documents to submit.

Chaffetz and Goodlatte highlighted the FBI director's description of the multiple servers and devices Clinton used to host her emails, a revelation that cut against the Democratic nominee's statement during the Benghazi hearing that she had used just one server.

Their letter also pointed out that Clinton claimed she had turned over all her work-related emails while Comey said the FBI recovered thousands of official communications that were never provided to the State Department.

Clinton has taken fire in the weeks since the FBI cleared her of criminal wrongdoing for mischaracterizing Comey's testimony in campaign speeches and media interviews.

The former secretary of state has argued Comey confirmed during his hearing the truthfulness of her public statements about the emails, although Comey merely said Clinton's public words matched her private ones. He also noted that the evidence complied during the year-long FBI investigation undermined both sets of statements.