The US president is set to propose a three-year partial freeze on domestic spending in his 2011 budget, administration officials say.

The freeze, to be announced in Barack Obama's State of the Union speech on Wednesday, would exclude defence, veteran affairs, homeland security and spending on international affairs, the officials said.

"We are in the midst of fighting a war and have security needs. We're going to fund those security needs as necessary," one of the officials said, speaking on condition of anonymity.

The freeze in "non-security discretionary spending "will be implemented in 2011 and continue throughout 2012 and 2013.

"The savings from the three-year freeze will amount to $250bn over the next decade," the official said.

Second Obama budget

Details of the spending hold-down will be spelt out in detail on February 1, when Obama unveils his second budget since taking office.

Agencies that could feel the pinch include the commerce, interior, justice and labour departments, as well as the environmental protection agency.

Obama's proposed budget savings will need to be approved by Congress.

The US government closed its 2009 fiscal year with a record $1.4 trillion budget deficit and the White House forecasts an even bigger gap of $1.5 trillion in fiscal 2010.

The proposed freeze would cut the deficit by between $10bn and $15bn in fiscal 2011.

Republicans dismissed the move as window-dressing by Obama's Democrats after an "unprecedented spending binge."

"This is like announcing you're going on a diet after winning a pie-eating contest," Michael Steel, spokesman for John Boehner, the House of Representatives Republican leader, said.

Bernanke nomination

In other US economic news, senators are hesitating to approve Ben Bernanke, the federal reserve chairman, for a second term.

A poll by Reuters news agency showed 38 senators were either committed to approving the nomination or leaning that way, while 17 were outright opposed or inclined that way.

Obama said on Monday that Bernanke had his "strongest support".

"He has my strongest support. I think he's done a good job," Obama said in an interview with ABC News.

"What we need is somebody at the Federal Reserve who can make sure that the progress that we've made in stabilising the economy continues, and I think Bernanke's the best person for that job."