(CNN) — Most first-time homebuyers in the United States take out 30-year mortgages. Under a new proposal from the Trump administration, they may soon have an even longer loan option.

This week, President Donald Trump introduced a new idea to tackle home affordability: a 50-year mortgage loan. Federal Housing Finance Agency Director Bill Pulte called the proposal “a complete game changer.”

While Trump’s proposal is light on details, administration officials say a 50-year mortgage would lower monthly payments, helping more Americans currently priced out of the market.

But many housing experts warn the plan could backfire, raising the cost of homeownership by stretching out payments, adding more interest over time and driving up home prices.

“This is not a good idea,” said Richard Green,

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