The contents of the call between GOP operative Arthur Schwartz and journalist Cassandra Fairbanks – which could turn Julian Assange’s UK extradition trial upside down – were reported on Tuesday by several US media outlets citing nonprofit transparency group Property of the People. The recording itself was later released by Fairbanks on Twitter.

In the call, dated September 2019, Schwartz pleads with Fairbanks to delete a September 10 tweet in which she says that Richard Grenell, then a controversial US envoy to Germany, “was the one who worked out the deal for Julian Assange’s arrest.”

Initially, Fairbanks refused to budge, arguing that her tweet was based on an ABC News report from last April alleging that Grenell was instrumental in persuading Ecuador to let British police into its London embassy, where Assange spent some seven years under political asylum. The report suggested that Grenell promised Quito that the US would not pursue the death penalty for the self-exiled publisher if it gave the go-ahead for the raid.

Schwartz, however, insisted that Fairbanks must scrub the tweet, accusing her of publishing “classified information.”