(CNN) — President Donald Trump and his economic advisers are planning a historic sale of stock in Fannie Mae and Freddie Mac, the government-owned mortgage giants that help provide stability and affordability to America’s home loan market.

The plans, first reported by the Wall Street Journal , have not yet been finalized, and Trump continues to weigh various options, according to a senior administration official. But the White House believes an initial public offering of up to 15% of the two companies’ shares could raise $30 billion, which could make it the largest IPO in history.

The president has been weighing an IPO for years. Trump’s first administration tried — and failed — to privatize Fannie and Freddie from the government conservatorship. But Trump has renewed his effort in

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