McMullin, a former CIA operative and House GOP aide, made the comment while slamming Trump’s reported pick of Exxon Mobil CEO Rex Tillerson for secretary of State.

“It must be clear that Donald Trump is not a loyal American and we should prepare for the next four years accordingly,” McMullin wrote on Twitter.

McMullin argued that with the selection of Tillerson, “Trump has identified a potential secretary of state unlikely to oppose Trump’s alignment with Putin.”

He also accused Trump of “purposely dismantling barriers that protect our nation from dangerous Russian subversion, which he has also welcomed.”