The agency is also investigating the thwarted Yemen plot, according to Mueller.

CNN: Holder assigns prosecutors to investigate leaks

According to information from her publicist Nadine Jolson, Joosten embraced the "Desperate Housewives" plot that called for her to be diagnosed with -- and eventually succumb to -- lung cancer in the series' final season.

CNN: STORY HIGHLIGHTS

Ms. White, Mr. Khuzami and another prosecutor made the case for indicting the cleric for the plot at a high-level meeting at the Justice Department in Washington, according to people familiar with the meeting.

WSJ: Both Sides of SEC Nominee Face Heat

There was a plot to oust the then Ulster Unionist leader, James Molyneaux, in 1982, according to newly-released confidential files.

BBC: James Molyneaux