WH chief of staff Susie Wiles diagnosed with early stage breast cancer, prognosis 'excellent,' Trump says

"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. Susie, as one of my closest and most important advisors, is tough and deeply committed to serving the American People," the president continued.

"She will soon be better than ever! Melania and I are with her in every way, and we look forward to working with Susie on the many big and wonderful things that are happening for the benefit of our Country!" Trump added.

The president also addressed the issue while sitting alongside of Wiles on Monday, calling her "fantastic," and describing her as "an amazing person, an amazing fighter." 

Trump said Wiles will "take care of it immediately as opposed to waiting," and that "she just started actually."

"This past week, I was diagnosed with breast cancer," Wiles said in a statement obtained by Fox News. "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.

"I am 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," she added.

Lawmakers have expressed well-wishes for Wiles.

Fox News' Jessica Loker contributed to this report