WASHINGTON — The White House is stepping up efforts to extend jobless benefits to long-term unemployed Americans, arguing that more than a million people will lose the assistance if it isn’t renewed by the end of the month, slowing economic growth.

In a report released today, the White House Council of Economic Advisers and the Labor Department concluded that if Congress allows benefits to expire, 3.6 million people will lose access to the benefits by the end of 2014.

Democrats are pressing for legislation continuing a program in place since 2008 that gives federally paid benefits to jobless people after their 26 weeks of state benefits run out. Republicans in the GOP-controlled House oppose it.

“Despite ten consecutive quarters of GDP growth and 7.8 million private sector jobs added since early 2010, the unemployment rate is unacceptably high at 7.3 percent, and far too many families are still struggling to regain the foothold they had prior to the crisis,” the report states.

The Congressional Budget Office said Tuesday that the Democratic legislation would cost $25 billion but stimulate the economy by 0.2 percent next year and create 200,000 jobs.

The report says that since 2008, nearly 24 million workers have received the unemployment insurance benefits.

More than 11 million Americans remain unemployed; of those, more than 4 million have been unemployed for more than 26 weeks.