France's Culture Minister Frederic Mitterrand is facing intense pressure over a book he wrote that described paying for "young boys" in Thailand.
The book was written four years ago, before he joined the government, but is back in the headlines following his impassioned support for Roman Polanski.
Polanski has been arrested in Switzerland on child sex charges.
Mr Mitterrand, nephew of late President Francois Mitterrand, is expected to defend himself on TV later on Thursday.
Mr Mitterrand has come under attack from right and left.
In his 2005 book The Bad Life
, he wrote: "I got into the habit of paying for boys," saying his attraction to young male prostitutes was not dimmed despite knowing "the sordid details of this traffic".
"All these rituals of the market for youths, the slave market excited me enormously... the abundance of very attractive and immediately available young boys put me in a state of desire."
Mr Mitterrand, 62, has denied being a paedophile, saying the term "boys" was used loosely.
The account of cruising for prostitutes in Thailand attracted little attention when it was published in 2005, when Mr Mitterrand was a TV personality.