When two former reporters started investigating President Donald Trump they stumbled across a raft of allegations linking him to the Kremlin.

Drowning in a morass of information, Glenn Simpson and Peter Fritsch turned to a contact, Christopher Steele, previously an MI6 agent. His dossier was leaked and gained a notoriety which was to have profound consequences for him, his colleagues, and the American President himself.

Their work eventually led to the Mueller report into Russian interference in the US elections. Now they’ve written a book, Crime in Progress, to set out their story.

I spoke to them both earlier.

I began by asking what they thought about the report’s findings.