The House Republican leading the investigation into Homeland Security Secretary Alejandro Mayorkas divulged that his office has been working with "informants" who have dirt on President Joe Biden's Cabinet member, including possible "fraud" at the department.

House Homeland Security Chairman Mark Green (R-TN) on Wednesday disclosed the five prongs of his attack against Mayorkas, who was confirmed by the Senate in January 2021 and was the Department of Homeland Security deputy secretary during the Obama administration.

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"We've had some people — they're informants at this point," Green said during an event at the conservative Heritage Foundation think tank. "They're not whistleblowers yet because that triggers a special process, but there's potentially some, some fraud going on in the department, too."

Green, a member of the conservative House Freedom Caucus, prioritized passing a border security bill in the first half of the year and has since pivoted the committee's focus toward investigating Mayorkas to see if he has committed high crimes and misdemeanors — grounds for impeachment.

Green said he personally devised the committee's approach to targeting Mayorkas.

"I came up with those five phases. The five phases are dereliction of duty — that's our first one when we just finished. The second one is the facilitation of cartel crime and how an open border is absolutely advancing the criminal activity inside the United States," Green said.

Phase three will examine the "human costs" sustained during Mayorkas's tenure. The mothers of teenagers and young adults who died from fentanyl overdoses, as well as the widow of a Border Patrol agent who committed suicide, will testify before the committee.

Phase four will look at the financial costs of more than 5 million people coming across the border illegally since Biden took office, including costs that hospitals have sustained providing care for illegal immigrants sick or injured while in federal custody.

The final part will focus on what Green said he has learned from informants. He did not specify if the informants were from inside DHS or outside the organization.

Green pointed to his committee's senior adviser John Cooper, a former senior Heritage employee who joined Green's staff in March, as "the guy that has penned" a forthcoming report on how Mayorkas was derelict of his duties.

"He’s done a fantastic job," Green said.

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The top committee Democrat, Rep. Bennie Thompson (MS), in June called Green's investigation a "sham" and criticized his colleague for "calling a hearing and saying 'case closed' before you've heard any testimony is not legitimate oversight."

The Washington Examiner reached out to DHS for comment as well as to Green's office for additional details on the informants.