The State of Trump's Union is a 10-part series airing on The Last Word in the run-up to the US election in November.

We'll be talking to a variety of people with informed views about the issues dividing and uniting the United States, where the country is politically, socially and economically, the dangers it's facing, where power lies and how it is used.

Our guest this week is Andrew Gimson, author of Gimson's Presidents: Brief Lives from Washington to Trump.

He spoke to Matt about how Donald Trump compares to past American presidents, why there has never been a female president and the role of the First Lady throughout history.