Filmmaker Eugene Jarecki takes a musical road trip across the U. S. in Elvis Presley's 1963 Rolls Royce during the 2016 presidential election, comparing Elvis's transition from country boy to "The King" to America's transformation into an empire.
The Duke of Edinburgh has spent a fourth day in hospital in London being treated for a "pre-existing condition".
, South Yorkshire , Prince Charles added: "At the moment that's all we know. "
Buckingham Palace said the admission was for "observation and treatment".
The Duke went to hospital on the advice of his doctor, it said in a statement.
The Duke , who retired from official solo royal duties in 2017, walked into hospital and was expected to remain there for a few days.
The Queen did not change her schedule and left Buckingham Palace for Norfolk by train, to begin her traditional festive break at Sandringham, where The Duke has spent much of his time since stepping back from public duties.The Queen was accompanied to church by The Countess of Wessex