In an essay to mark International Holocaust Remembrance Day, Anne Frank’s stepsister accused Republican presidential front-runner Donald Trump of “acting like another Hitler.”

Eva Schloss, now 86, was a friend of Frank’s in Amsterdam after their families fled Nazi Germany in the 1930s. Her mother, Fritzi, would marry Otto Frank, Anne’s father, after World War II.

“If Donald Trump become(s) the next president of the U.S. it would be a complete disaster,” she told Newsweek on Wednesday. “I think he is acting like another Hitler by inciting racism.”