Donald Trump announced Susie Wiles's diagnosis on Truth Social. (AP: Alex Brandon)
In short:
Susie Wiles, who is currently serving as Donald Trump's chief of staff, has been diagnosed with breast cancer, the US president has said.
Dubbed by Mr Trump as "the Ice Maiden", Ms Wiles is widely credited with avoiding a repeat of the infighting and chaos of Mr Trump's first term in the White House since his re-election in 2024.
What's next?
Mr Trump says the cancer was detected early and Ms Wiles will continue working from the White House as she receives treatment.
US President Donald Trump says his chief of staff has been diagnosed with early stage breast cancer but will continue working in the White House.
Describing her as an "incredible Chief of Staff, a great person, and one of the strongest people I know", Mr Trump said Ms Wiles would begin treatment immediately.
"She has a fantastic medical team, and her prognosis is excellent! During the treatment period, she will be spending virtually full time at the White House, which makes me, as President, very happy!" Mr Trump wrote on his social media platform Truth Social.
"Her Strength and her Commitment to continue doing the job she loves, and does so well, while undergoing treatment, tells you everything you need to know about her."
Ms Wiles is one of Mr Trump's closest political allies and advisers, having played a prominent role on his 2024 presidential election campaign before stepping into the position as his chief of staff.
She is the first woman to be appointed to the high-powered position.
Ms Wiles has been widely credited with running a more disciplined White House in Mr Trump's second term when compared to his first, which was repeatedly rocked by resignations and internal leaks.
Mr Trump has previously dubbed Ms Wiles — who first worked for him in Florida during his 2016 run for the presidency — "The Ice Maiden" and "the most powerful woman in the world".
Usually preferring to keep a low profile, Ms Wiles caused a stir last year after holding a number of interviews with a journalist for magazine Variety in which she gave candid assessments of the performance of Mr Trump and other members of his administration.
Shortly after Mr Trump announced her diagnosis on Truth Social on Monday, local time, Ms Wiles appeared beside the president at a press event.