President Barack Obama is likely to announce plans next week to run for re-election and file campaign papers with the Federal Election Commission as early as Monday, Democratic officials said on Saturday.
Filing with the FEC would allow Obama, a Democrat, to start raising money for the 2012 campaign that is expected to shatter records in political spending.
Two Democratic officials said no final decision has been made about the timing of an announcement or filing.
Obama is in the middle of a budget battle with congressional Republicans and has focused his message in recent weeks on reducing US dependence on foreign oil and investing in innovation and education -- themes he likely will highlight in his bid to hold on to the White House next year.
At the same time, Obama has been defending US involvement in military operations in Libya.
Republicans are pressing Democrats to make deep spending cuts to shrink the US deficit, another issue that could play a crucial role in the campaign.
The Republican field of presidential challengers is still wide open, however, and no one has formally announced a bid.
Obama is expected to avoid overt campaigning while his potential Republican opponents compete against each other.
But he has started doing some fundraising events for his party in recent weeks. Formally announcing his candidacy would allow Obama to start filling his own campaign's coffers directly, too.
The president got a boost on Friday with a Labor Department report showing a slight decline in the US unemployment rate to 8.8%. An improving economy is seen as critical to his re-election hopes.
Opinion surveys show US voters are split over Obama. A Real Clear Politics average of several polls showed 47.4% of Americans approving of his performance in office and 46.6% disapproving.
Poll averages also show Obama beating potential Republican rivals including former Massachusetts Governor Mitt Romney, former Alaska Governor Sarah Palin and former Speaker of the House of Representatives Newt Gingrich.
Obama, a US senator from Illinois before winning the 2008 US presidential election, intends to base his re-election campaign out of Chicago. Obama's former White House chief of staff Rahm Emanuel was elected major of Chicago in February and will take office May 16 when longtime Mayor Richard M Daley retires.