Donald Trump Jr. stormed out of an event promoting his new book after he was heckled by a protester and supporters angered by his refusal to take questions. In a clip broadcast by Fox 2 KTVU, the protester who worked her way inside the launch of "Triggered: How the Left Thrives on Hate and Wants to Silence Us" can be heard shouting "immigrants are welcome here" to booing from Trump Jr.'s audience."My mom is an immigrant," the president's son responded. "But she did it legally."