Dominion Voting Systems on Monday sent a cease and desist letter to My Pillow CEO Mike Lindell over his spread of misinformation related to the 2020 election.

Why it matters: Trump and several of his allies have pushed false conspiracy theories about the company, leading Dominion to take legal action. It’s suing pro-Trump lawyer Sidney Powell for defamation and $1.3 billion in damages, and a Dominion employee has sued Trump himself, OANN and Newsmax.

The letter also orders Lindell to “preserve and retain all documents relating to Dominion and your smear campaign against the company.”

Lindell also must preserve all communications with any member of the Trump campaign, in addition to communications with Rudy Giuliani, Powell, Jenna Ellis and Lin Wood.