Immigration law experts say the “gold card” proposal is far more complicated and uncertain than President Donald Trump and Commerce Secretary Howard Lutnick made it sound when they announced it last week.

President Donald Trump’s bid to lure wealthy immigrants to the U.S. with a “gold card” program could drive up home prices and worsen America’s housing-affordability crisis, according to real-estate experts and people who’ve studied similar immigration incentives in Europe.

Estimates of how many millionaires could afford to buy Trump's proposed visa range from 1.5 to 3.3 million people, according to recent reports.