Elizabeth Warren (D-Mass.) seems to have struck a nerve by calling for Donald Trump to hold Elon Musk to the kind of ethics standards set for government officials while the tech billionaire remains a major figure in the president-elect’s orbit.

Tech billionaire Elon Musk hit back at Sen. Elizabeth Warren (D-MA) with a series of snarky memes after she decried possible conflicts of interest between him and President-elect Donald Trump. Warren sent a letter to Trump questioning whether he had put ethics rules in place for dealing with Musk's governmental work as the X executive plans to co-lead the Department of Government Efficiency.