Activist investor Bill Ackman expressed support for a merger between Fannie Mae and Freddie Mac as President Trump mulls making both of the mortgage securitizing firms public companies.

Ackman, a prominent Trump supporter, argued that merging Fannie and Freddie would help bring down mortgage rates and "enable them to achieve huge synergies" in their efforts to support the U.S. home loan market.

"A merger........

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