Greenwald co-founded the outlet in 2014, with Laura Poitras and Jeremy Scahill, in part as a vehicle to publish the revelations from NSA whistleblower Edward Snowden. Editorial freedom was supposed to be the Intercept’s core mission, he explained in a letter of resignation posted on Thursday.

The publication “now bears absolutely no resemblance to what we set out to build – not in content, structure, editorial mission or purpose,” Greenwald wrote.

Instead, it is “rapidly becoming just another media outlet with mandated ideological and partisan loyalties, a rigid and narrow range of permitted viewpoints (ranging from establishment liberalism to soft leftism, but always anchored in ultimate support for the Democratic Party), a deep fear of offending hegemonic cultural liberalism and center-left Twitter luminaries, and an overarching need to secure the approval and admiration of the very mainstream media outlets we created The Intercept to oppose, critique and subvert,” Greenwald wrote in a Substack post explaining his decision to leave.