The Trump administration is weighing selling between 5% and 15% of stock in mortgage buyers Fannie Mae and Freddie Mac in an initial offering that could raise up to $30 billion and be the largest

Trump has said he wants to take government backed mortgage giants Fannie Mae and Freddie Mac public. But it remains unclear if they will remain under conservatorship or how their shares will be valued.

And it will mean clarifying exactly what the Trump administration hopes to achieve with the process. The first challenge is the companies’ insufficient capital. Fannie and Freddie have vast balance-sheets,