President Obama is using his executive authority to expand overtime pay for millions of American workers. The move will expand overtime eligibility to workers whom corporations have classified as “executive or professional” employees in an effort to avoid paying them for extra work. These include store managers, office workers, loan officers and computer technicians. Corporate lobbying groups have long opposed the expansion of overtime pay. Republicans are expected to mount opposition on top of their effort to block Obama’s raising of the minimum wage for federal workers to $10.10 an hour.