MSNBC host Rachel Maddow in December 2017 aired a special report on the Trump-Russia dossier compiled by former British intelligence officer Christopher Steele. That document, claimed Maddow, relied on information coming from Steele’s “deep cover sources inside Russia.”

A federal indictment unsealed Thursday has something to say about the quality of those “sources.”

We learn from special counsel John Durham’s indictment of Igor Danchenko that “the FBI ultimately devoted substantial resources attempting to investigate and corroborate the allegations” in the now-infamous Steele dossier. “Ultimately” is right — but not before it relied on the shoddy document to surveil an American citizen in an investigation that produced the Mueller probe and a two-year-long obsession with Trump and Russian built on a preposterous foundation.

Christopher Steele, the former MI6 spy who compiled the notorious dossier during the 2016 campaign alleging ties between Donald Trump and Russia, made a splash a few weeks back when he gave his first interview about it. Steele described his professionalism as an intelligence-gatherer to George Stephanopoulos of ABC News and then doubled down on some of the dossier’s most salacious allegations, asserting, among other things, that the infamous “pee tape” involving Trump may be still out there, just waiting to be found.