Here's how Trump's plan to load up on mortgage bonds could impact housing affordability

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• Trump's latest idea to make housing more affordable is aimed at tamping down mortgage rates.
• The president said he ordered "representatives" to purchase $200 billion in mortgage bonds.
• Some industry experts are skeptical, and lower rates could also ultimately raise home prices.

President Donald Trump this week has zeroed in on an issue that's at the heart of America's affordability crisis: housing costs.

But it's not clear if his latest proposal...