The Obama administration on Friday will announce broad new initiatives to help troubled homeowners, potentially refinancing several million of them into fresh government-backed mortgages with lower payments.

Another element of the new program is meant to temporarily reduce the payments of borrowers who are unemployed and seeking a job. Additionally, the government will encourage lenders to write down the value of loans held by borrowers in modification programs.

The escalation in aid comes as the administration is under rising pressure from Congress to resolve the foreclosure crisis, which is straining the economy and putting millions of Americans at risk of losing their homes. But the new initiatives could well spur protests among those who have kept up their payments and are not in trouble.

The administration’s earlier efforts to stem foreclosures have largely been directed at borrowers who were experiencing financial hardship. But the biggest new initiative, which is also likely to be the most controversial, will involve the government, through the Federal Housing Administration, refinancing loans for borrowers who simply owe more than their houses are worth.