Buckingham Palace announced that King Charles had been diagnosed with cancer on Feb. 5, though it has not released anything about the type of cancer, or its severity.
The cancer was discovered following procedure the king underwent at the hospital for an enlarged prostate.
“His Majesty has today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties,” the palace said at the time, noting that the king would “continue to undertake State business and official paperwork as usual.”
Sunak said via Twitter the same day the news was announced that he was wishing Charles “a full and speedy recovery.”
“I have no doubt he’ll be back to full strength in no time and I know the whole country will be wishing him well,” the prime minister added.