Sen. John McCain slammed Secretary of State Rex Tillerson in a New York Times op-ed published Monday morning, accusing the nation’s chief diplomat of adopting a foreign policy that abandons both U.S. values and victims of oppression around the world.

McCain’s op-ed came in response to remarks Tillerson delivered last week to State Department employees, in which he said that “in some circumstances if you condition our national security efforts on someone adopting our values, we probably can’t achieve our national security goals.” Tillerson’s boss, President Donald Trump, has made a habit of offering warm words for dictators and political strongmen from around the world, including Turkey’s Recep Tayyip Erdoğan, Egypt’s Abdel Fattah el-Sisi, Russia’s Vladimir Putin and North Korea’s Kim Jong Un.

“With those words, Secretary Tillerson sent a message to oppressed people everywhere: Don’t look to the United States for hope. Our values make us sympathetic to your plight, and, when it’s convenient, we might officially express that sympathy,” McCain (R-Ariz.), the chairman of the Senate Armed Services Committee, wrote. “But we make policy to serve our interests, which are not related to our values. So, if you happen to be in the way of our forging relationships with your oppressors that could serve our security and economic interests, good luck to you. You’re on your own.”