Elon Musk brought his son, X Æ A-Xii or “Lil X,” to an Oval Office meeting with President Donald Trump, and was criticized by the boy’s mother, Canadian musician Claire Elise Boucher, known as Grimes.

MSNBC host Lawrence O’Donnell also said that the little boy’s presence in an Oval Office press conference with Trump Tuesday was ‘a power play’ by the tech billionaire.

Grimes, Musk’s former partner and mother to three of his 12 children, was seemingly less than thrilled when she found out via social media about her son’s public appearance.