WASHINGTON, Sept 10 (Reuters) - U.S. lawmakers on Tuesday will question Trump administration officials on their plan to release mortgage giants Fannie Mae and Freddie Mac, which guarantee over half the nation's mortgages, from government control more than a decade after they were bailed out during the 2008 financial crisis.
U.S. Treasury Secretary Steven Mnuchin, Housing and Urban Development Secretary Ben Carson, and Federal Housing Finance Agency Director Mark Calabria will defend their long-awaited blueprint for overhauling the U.S. housing finance system before the U.S. Senate Banking Committee.
The release of their report, ordered by President Trump in March and published Thursday, is a critical first step on the long road to reforming Fannie and Freddie after a 2012 attempt by the Obama administration fell flat.
Investors disappointed by a lack of detail and concrete timelines for changes on Thursday will be listening closely for more information.
Lawmakers are expected to cover a range of tricky legal and economic issues, including how the Treasury plans to bolster Fannie and Freddie's capital and exit its investments.
They are also likely to focus on the plan to shrink the pair's footprint in the secondary mortgage market and reduce their risk to the financial system, all while keeping mortgage costs stable.
"From the left, the questions will focus on affordability concerns...From the right, the questions will focus on competition and market functioning," Isaac Boltansky, director of policy research at Washington-based Compass Point Research & Trading, said in a note on Monday.
Thursday's report called for Congress to pass legislation to ensure the housing market is not destabilized, notably by giving an explicit government guarantee for Fannie and Freddie's mortgage-backed securities, and setting up new charters that would allow other firms to compete.
Republicans and Democrats are already at odds over the report. Republicans praise the inclusion of several recommendations outlined in a draft bill unveiled by committee chair Senator Mike Crapo in February. Democrats say the plan will drive up housing costs for lower-income Americans, however.
In a Monday interview with Fox Business, Mnuchin said the administration would begin pursuing reforms within six months if Congress failed to advance its own plan.
Reporting by Pete Schroeder; editing by Michelle Price