Rep. Mark Walker, a Republican from North Carolina, was present at the controversial rally held by President Donald Trump last week, during which supporters chanted “send her back” as the president attacked Rep. Ilhan Omar. On CNN Monday, Walker said hearing the chant was an “immediate dagger that went through my heart.”

“My wife, Wolf, is a two-time historical black college and university graduate, as a former minister we have worked years in the inner cities,” Walker said. “The minority communities that value or put a little bit of trust and value in what we’re trying to do in Washington, I immediately thought of those folks.”

“I do not want to support in any way, shape or fashion, a phrase that for decades has been represented to hurt people in minority communities,” he added.