Members of the House Oversight and Government Reform Committee called for a criminal investigation of a former agency chair accused of lying to Congress about his private email use.

Rafael Moure-Eraso, former head of the Chemical Safety Board, has come under fire for using a personal email account to conduct government affairs in a number of congressional hearings on his management of the agency.

The embattled official said under oath at a June 2014 hearing that he had stopped using private emails "about a year and a half" before his appearance, Reps. Jason Chaffetz and Elijah Cummings said in a letter to Attorney General Loretta Lynch Wednesday.

But the Environmental Protection Agency's inspector general — which oversees the Chemical Safety Board — later gave the Oversight Committee evidence that Moure-Eraso had continued conducting government affairs on his private account "until a much later date," Chaffetz and Cummings said.

Moure-Eraso also falsely testified that he had consulted with the Chemical Safety Board's general counsel before signing off on a request to tap the emails of two of his own employees, a claim the inspector general later debunked, the letter noted.

"The inconsistencies between Mr. Moure-Eraso's testimony and other information received by the Committee raise significant concerns about the truthfulness of Mr. Moure-Eraso's testimony," Chaffetz and Cummings said in the letter asking Lynch to investigate whether the former agency head committed perjury.

Chaffetz, who is chairman of the Oversight Committee, called for Moure-Eraso to resign during a March hearing.

"Until you leave this organization, these problems are going to persist," the Utah Republican told Moure-Eraso in March. "There is something rotten to its core, and it is you."

Moure-Eraso faced allegations of retaliating against whistleblowers and obstructing investigations for more than a year.

The EPA's inspector general said in a March 4 statement that Moure-Eraso and his top associates had attempted to withhold their private emails from the watchdog during an investigation of his record-keeping.

Moure-Eraso and his general counsel "purposefully employed nongovernmental systems so that certain CSB business did not appear on CSB systems," the inspector general concluded.

The scandal-ridden chairman stepped down from his position March 26.