WASHINGTON (AP) - President Barack Obama is casting Mitt Romney as a greedy, job-killing corporate titan with little concern for the working class in a new, multi-pronged effort that seeks to undermine the central rationale for his Republican rival's candidacy: his business credentials.

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At the center of the push - the president's most forceful attempt yet to sully Romney before the November election - is a biting new TV ad airing Monday that recounts through interviews with former workers the restructuring, and ultimate demise, of a Kansas City, Mo., steel mill under the Republican's private equity firm.

"They made as much money off of it as they could. And they closed it down," says Joe Soptic, a steelworker for 30 years.

Jack Cobb, who also worked in the industry for three decades, adds: "It was like a vampire. They came in and sucked the life out of us."

The ad, at the unusual length of 2 minutes, will run in five battleground states: Iowa, Ohio, Pennsylvania, Virginia and Colorado.

The campaign declined to describe the size of the ad buy though it's in the middle of running a $25 million, month-long ad campaign in nine states.

A longer version of the ad was being posted online Monday. Romney campaign officials said they "welcome" any discussion about jobs.

"Mitt Romney helped create more jobs in his private sector experience and more jobs as governor of Massachusetts than President Obama has for the entire nation," Romney spokeswoman Andrea Saul said in a statement.

The commercial will be coupled with a series of events Obama's campaign is holding this week in Florida, Missouri, Iowa, Nevada and North Carolina to highlight Romney's role at Bain Capital, a company he co-founded.

It's unclear whether Obama, himself, will criticize his Republican rival on the subject when the president appears at events in New York on Monday or whether he'll leave the skewering to campaign surrogates as he prepares to meet with foreign leaders during the G-8 and NATO summits later this week.

Also this week, Vice President Joe Biden holds two days of events in Ohio, where he's expected to discuss Romney's role as a corporate buyout specialist.

Romney previously had accused Obama of attacking free enterprise and called the criticism of his business background an attempt by Democrats to distract voters from the president's record. Both candidates were entering a new week in the campaign seeking to shift the focus back to voters' No. 1 issue, the economy, from social issues that dominated after the president announced his support for gay marriage.

The two campaigns contend that in a nation where unemployment is hovering around 8 percent, voters will choose between Obama and Romney based on economic arguments.