Cecilia Muñoz was quoted in a New York Times article.
Critics said Mr. Trump’s action in February belied his words on Monday.
“If this is a mental health problem, it begs the question of why we let people with mental health problems have access to firearms,” said Cecilia Muñoz, who was Mr. Obama’s domestic policy adviser.
She acknowledged that it was tricky determining who had a mental illness serious enough to make them a risk and therefore worthy of inclusion in the background check database. “It is controversial,” she said. “It’s not easy to figure out where you draw the line. But it is important to draw a line.”