The 18th Century Precedent for Trump's Impeachment

As the impeachment trial of Donald Trump got underway in the USA the 18th-century case of Warren Hastings, the former Governor-General of Bengal was cited as a precedent for someone being impeached after they had left office. But what happened to bring about Hastings' impeachment and why does this case matter now? I'm joined by best selling author, an expert on the East India Company and a rock star of 18th-century history William Dalrymple to find out.