WASHINGTON—After months of criticism that it hasn't done enough to prevent foreclosures, the Obama administration is announcing a plan to reduce the amount some troubled borrowers owe on their home loans. Discuss COMMENTS (86) The multifaceted effort will let people who owe more on their mortgages than their properties are worth get new loans backed by the Federal Housing Administration, a government agency that insures home loans against default. That would be funded by $14 billion from the administration's existing $75 billion foreclosure-prevention program. But it could spark criticism that the government is shouldering too much risk by taking on...