White House Chief of Staff Susie Wiles has early stage breast cancer

President Trump's most trusted adviser, White House Chief of Staff Susie Wiles, has early stage breast cancer, Trump announced Monday. The big picture: The 68-year old plans to stay on the job while undergoing treatment, she said. Trump said she has his full confidence and support.

Wiles takes part in nearly every major decision Trump has made as president. She also assembled his White House staff that's deeply loyal to both the president and her.

What she's saying: "This past week, I was diagnosed with breast cancer," Wiles said in a written statement.

"Nearly one in eight women in the United States will face this diagnosis. Every day, these women continue to raise their families, go to work, and serve their communities with strength and determination. I now join their ranks."

Inside the room: White House staffers were saddened by the announcement but expressed optimism about her treatment and toughness.

"Susie led President Trump's team through illegitimate indictments, domestic spying by the former administration, rigged federal prosecutions, illegal law enforcement raids, general lawfare, assassination attempts, & more," James Blair, a Wiles understudy and deputy White House chief of staff, wrote on X. "As with the rest, she will win this battle with grace."

What's next: Wiles has yet to decide on an exact course of treatment and said said she was "grateful to have an outstanding team of doctors who detected the cancer early and are guiding my care, and I am encouraged by a strong prognosis."

"I am also deeply thankful for the support and encouragement of President Trump as I undergo treatment and continue serving in my role as White House Chief of Staff."

Editor's note: This story was updated with additional reporting.