The Democratic acting chair, Susan Wild of Pennsylvania, and acting ranking member, Michael Guest, a Mississippi Republican, released a statement on Wednesday.
The subject of the investigation was not revealed.
Ocasio-Cortez won her seat in Congress in 2018, after a shock primary victory over Joe Crowley, a senior House Democrat. She has since emerged as a leading figure among progressives, widely known as AOC and the target of rightwing invective and harassment.
Perón, an actor married to the Argentinian president Juan Perón, championed working-class and female voters but died of cancer in 1952, aged 33.
Outside Argentina she is largely known through Evita, a musical by Andrew Lloyd Webber and Tim Rice which premiered in London in 1978 and on Broadway in 1979 and which Trump has said is his favourite show, having seen it six times.
