US President-elect Joe Biden will nominate Pete Buttigieg, a former campaign rival, to be transportation secretary, US media reported Tuesday, a move that would make him the first openly gay member of a presidential cabinet. Buttigieg, just 38, is a former Indiana mayor who put his civic duties on hold to serve as a US Navy intelligence officer in Afghanistan. He enjoyed a meteoric political rise as he sought the 2020 Democratic presidential nomination, but dropped out and quickly supported Biden. mlm/st