It was a response to "the twitter files" being released on Twitter, by the new owner of Twitter.

And it was made by someone who had been invited back onto Twitter by Musk.

Eh we all know Trump uses toilet paper with the US Constitution printed on it. I doubt that is what prompted him to being of the mind that his whims are more important than democracy or the US Constitution. Release of those "files" only led him to repeat what he has said/implied on multiple occasions in the past, including encouraging the Jan 6 coup attempt.