ฮThe UK and the European Union appear to be on the brink of completing a new Brexit deal for Northern Ireland.
A No 10 source describes the negotiations as "positive".
King Charles had also been due to meet the president of the European Commission in the UK on Saturday, the BBC understands.
Multiple sources say the visit has been cancelled due to operational reasons unconnected to the political talks.
The planned meeting between the King and Ursula von der Leyen, originally reported by Sky News, was not part of the negotiations between the UK and the EU. 168บาคาร่า