In the first week of Black History Month, President Donald Trump posted a racist depiction of former President Barack Obama and first lady Michelle Obama on social media — a video clip showing the Obamas’ faces on apes. The post was later deleted, and the White House blamed a staffer for “erroneously” posting it. On Friday evening, Trump refused to apologize for the post: “I didn’t make a mistake,” he told reporters aboard Air Force One. The post was one of dozens Trump shared in the middle of the night…