The Communications Minister Pat Rabbitte says the RTE board has questions to answer about whether it should sell 2fm.
Mr Rabbitte says the broadcaster is "very defensive" about the station - which suffered losses of €13m between 2010 and 2012.
The Minister has refused to give his own opinion on whether the station should be sold, but he says 2fm was set up in a different era and questions need to be asked about its future.
He said: "I'm a bit reluctant given my position to express personal opinions - but I think the broadcasting environment at the time when 2fm came into existence was very different.
"Does 2fm do something different from - or better than - the alternative options?
"That's a question I think that does require to be asked."