President Donald Trump’s pick to handle relief efforts for migrants across the globe has come under fire for calling Muslims violent and suggesting that Christian refugees should get priority in certain situations. Ken Isaacs, a vice president of the Christian relief organization Samaritan’s Purse, was announced Thursday as Trump’s nominee to become director general of the United Nations’ International Organization for Migration. Following the announcement, several of Isaacs’ social media posts came to light in which he made disparaging remarks about Muslim refugees. In one such post cited by The Washington Post, Isaacs responded to news of a terrorist attack by saying the “Muslim faith instructs the faithful” to wage violence. In another, Isaacs said Christian refugees should be “1st priority” in certain relief efforts. State Department officials said Isaacs’ social media posts had not been reviewed prior to his nomination. Isaacs offered an apology for his comments after the State Department was made aware of them. “I deeply regret that my comments on social media have caused hurt and have undermined my professional record,” he said in a statement late Saturday.