The monarchy faces an unusual cut in public funding and at the same an increase in demands for more financial transparency.
On the final day of the state visit, the royal couple headed to Virginia for a more informal experience of the US.
King Charles III and Queen Camilla are concluding their four-day state visit to the US, bidding farewell to President Trump and First Lady Melania Trump.
King Charles' historic state visit, the first by a British monarch since Queen Elizabeth II's in 2007, has come to an end.
BBC's Sarah Smith looks at whether King Charles' charm offensive with President Trump made a difference to US-UK relations.
As the UK's head of state, King Charles has number of parliamentary and constitutional duties.
The Queen will reflect on the childhood experiences that sparked her passion for reading and reflect on the comfort she still finds in books.
Indigenous leaders made Charles aware of the "threat" posed by the movement during a meeting in London, they say.
King Charles hails the value of the Commonwealth in divided times in his annual message.
