Kevin Mayer, the CEO of Tik Tok, has announced that he’s leaving the company after just three months of leading the social media company.

Mayer was also named chief operating officer of ByteDance, Tik Tok’s parent company. CNN obtained a memo Mayer sent to employees, reading:

“In recent weeks, as the political environment has sharply changed, I have done significant reflection on what the corporate structural changes will require, and what it means for the global role I signed up for. Against this backdrop, and as we expect to reach a resolution very soon, it is with a heavy heart that I wanted to let you all know that I have decided to leave the company.” 

A TikTok spokesperson responded to Kevin’s departure in a statement that read, “We appreciate that the political dynamics of the last few months have significantly changed what the scope of Kevin’s role would be going forward, and fully respect his decision.” 

ByteDance founder Zhang Yiming also responded, stating that he understood “that the political circumstances we are operating within could have significant impact on [Mayer’s] job in any scenario.”