Mealey's (November 25, 2019, 1:40 PM EST) -- WASHINGTON, D.C. — The text of Age Discrimination in Employment Act (ADEA) Section 633a(a) and U.S. Supreme Court precedent require that an employee alleging age discrimination must show that bias was the but-for cause of the action he or she is challenging, the secretary of Veterans Affairs argues in his Nov. 22 respondent brief filed in the U.S. Supreme Court (Noris Babb v. Robert Wilkie, No. 18-882, U.S. Sup.)....