Alastair Campbell was former British Prime Minister Tony Blair's chief strategist from 1994 to 2003.

He has spoken candidly about his struggle with depression and suicidal thoughts, which he details in a new book, Living Better: How I Learned to Survive Depression.

He joined Matt on The Last Word to talk about his condition and its impact on his family, how he learned to manage it, and his hope that writing about it will help create a better understanding of mental health.