MILWAUKEE (AP) — A combative President Barack Obama rolled out a long-term jobs program Monday that would exceed $50 billion to rebuild roads, railways and runways, and coupled it with a blunt campaign-season assault on Republicans for causing Americans’ hard economic times.

GOP leaders instantly assailed Obama’s proposal as an ineffective one that would simply raise already excessive federal spending. Many congressional Democrats are also likely to be reluctant to boost expenditures and increase federal deficits just weeks before elections that will determine control of Congress.

Jim Manley, spokesman for Senate Majority Leader Harry Reid of Nevada, cautioned, “If we are going to get anything done, Republican cooperation, which has been all but non-existent recently, will be necessary.”

That left the plan with low, if not impossible, odds of becoming law this year. When Congress returns from summer recess in mid-September, it is likely to remain in session for only a few weeks before lawmakers return home to campaign for re-election.

Administration officials said that even if Congress quickly approved the program, it would not produce jobs until sometime next year. That means the proposal’s only pre-election impact may be a political one as the White House tries to demonstrate to voters that it is working to boost the economy and create jobs.