Prince Harry has been summoned by his grandmother, Queen Elizabeth, for a crisis meeting after he and his wife Meghan announced that they would be stepping back from royal duties.

Meghan, who has already left for Canada, will attempt to join the meeting via telephone, according to Reuters.

Harry's father Prince Charles and his brother Prince William, will also attend the meeting on Monday.

The palace source said it remained the queen's aim to find a resolution to the crisis in days rather than weeks but it would require "complex and thoughtful discussions" and any agreement would take time to be implemented.