Critics of President Donald Trump are trying to put a rift between him and his chief strategist, Steve Bannon. Their method of choice? Snail mail.

Controversy has swirled around Steve Bannon ever since Trump made him his chief strategist shortly after his election, who was also a part of Trump's campaign. Bannon is the the former head of Breitbart News, a favorite platform of the "alt-right" (AKA white nationalists). In office, Bannon has been considered the mastermind of many of Trump's policy moves, including the Muslim ban that's currently in the midst of a legal battle.

Right after the Muslim ban was announced and Bannon was appointed to the National Security Council, Twitter users began referring to him as "President Bannon" on the platform as a nod to the fact that he's had so much influence over Trump and his administration's agenda. The move created further tension for Trump (and attention for Bannon) because the chairman of the Joint Chiefs of Staff and the Director of National Intelligence were taken off of the council.

Now, critics of Trump have started a new campaign called #PostcardstoBannon, where they send letters, notes, and postcards to the White House. The catch? Instead of addressing them to the actual president, they're addressed to "President Bannon."

The campaign comes just days after Bannon appeared on the cover of Time magazine and Saturday Night Live poked fun at the chief strategist's seemingly dominant behavior over Trump. So far, no one in the White House has commented on the initiative, but prior to the postcards, Trump did tweet about how he "calls [his] own shots."

Understandably, no one sending these postcards believes Trump or Bannon will respond; the hope instead is that Trump will become even more irritated by Bannon's growing presence (and perhaps fire him), all while Bannon tries to avoid the spotlight and his boss's annoyance.

Related: Steve Bannon: 8 Things to Know About Donald Trump’s Chief Strategist

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