US President Barack Obama on Saturday attacked presumptive Republican presidential candidate Mitt Romney for outsourcing the jobs by his companies and said Americans don't need pioneers of outsourcing in Oval Office.

Obama said this while referring to a report in The Washington Post that the companies owned by Romney's firms were pioneers in the outsourcing of US jobs to countries like India and China.

"Today, it was reported in The Washington Post that the companies his firm owned were 'pioneers' in the outsourcing of American jobs to places like China and India," he said at an election campaign event at Tampa in Florida.

"Let me tell you, Tampa, we don't need an outsourcing pioneer in the Oval Office. We need a President who will fight for American jobs and fight for American manufacturing. That's what my plan will do. That's why I am running for a second term as President of the US," Obama said amidst rounds of applause from the cheering audience.

Led by Obama, his campaign attacked Romney accusing him of outsourcing jobs overseas. "The Washington Post reported this morning that 'Mitt Romney's financial company, Bain Capital, invested in a series of firms that specialised in relocating jobs done by American workers to new facilities in low-wage countries like China and India," wrote Stephanie Cutter on behalf of Obama Campaign.

"This is the same guy that goes around the campaign trail talking a huge game about being able to protect American jobs by standing up to foreign countries like China. But now we know that Romney and his partners made millions while sending American jobs overseas," she said in a video message emailed to hers supporters.

"Romney's support of outsourcing didn't just happen in the private sector. As governor of Massachusetts, he vetoed legislation that would have banned companies from shipping state jobs overseas -- and he actually outsourced state jobs to a call center in India," Cutter said.

"In contrast, President Obama has a jobs plan that could put up to a million people back to work -- including teachers, cops, firefighters, construction workers, and veterans -- help small businesses create jobs right now, and help to put an end to American jobs being shipped overseas. He's also fighting for tax breaks for companies that bring jobs back to America," she said.

In a conference call, David Axelrod, senior strategist to Obama for America referring to The Washington Post article said: "It's particularly egregious coming on a day when Governor Romney began running an ad in Ohio promising to stand up to China, demanding a level playing field for our businesses and workers when it turns out his companies were actively involved in shipping jobs to China and India."

Nothing in Governor Romney's background suggests that he would be the advocate for American workers and American jobs that he portrays himself to be. Nor does it suggest -- nothing in his background suggests that he would, in fact, stand up to China or any other country on behalf of American workers, he alleged.

Axelrod said Obama believes strongly that the US should be investing its efforts and tailoring its policies to insourcing of American jobs, to bringing jobs back here.