WASHINGTON — Senate Republicans will oppose any effort to renew soon-to-expire Bush administration tax cuts if upper-income taxpayers are excluded from the reductions.

A spokesman for Senate GOP Leader Mitch McConnell said Monday that every Senate Republican has pledged to oppose President Obama’s tax-cutting plan. Obama would renew the tax cuts for most people, but let the top income tax rate rise back to almost 40 percent on family or small business income over $250,000.

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House Minority Leader John Boehner, left, and Senate Minority Leader Mitch McConnell face reporters in June. Boehner now says he would back renewing tax cuts for the middle class but not the wealthy if that was his only choice. The Associated Press

McConnell has said a bill extending the tax cuts for only low- and middle-income earners cannot pass the Senate. Forty-one senators can block a bill with a filibuster, but McConnell spokesman Don Stewart declined to say whether all 41 Republicans would support a filibuster.

At issue is a year-end deadline to renew a variety of tax cuts enacted in 2001 – when the federal government was running a surplus.

On Sunday, House GOP Leader John Boehner said he would support renewing tax cuts for the middle class but not the wealthy if that was his only choice.

Democrats are worried that November elections could hand the GOP control of the House and perhaps the Senate. The White House and its Democratic allies hope to use the tax-cut fight to cast themselves as defenders of the middle class and Republicans as a party eager to revive the days of the still-unpopular former President George W. Bush.

“We’re going to take the next 50-some days to convince the public that’s exactly what the Republicans would do – back to the Bush policies,” White House Press Secretary Robert Gibbs said on NBC’s “Today” show.

Gibbs said the middle class should not be used as a political football by Republicans maneuvering to give tax cuts to wealthy taxpayers, who he said don’t need the reductions. Republicans say paring taxes for the wealthy would encourage them and the businesses they operate to create jobs.

Congressional analysts say renewing the tax cuts for everyone would cost the government $4 trillion over the next decade. With polls showing broad public anger over spiraling federal deficits, Obama wants to exclude individuals earning over $200,000 and couples making over $250,000 – who account for $700 billion of that total.

Democrats aren’t unified behind Obama and their House and Senate leaders. Several Senate Democrats say they would like all of the Bush tax cuts to be extended for another year or two as the economy slowly recovers from the recession.

“I don’t think it makes sense to raise any federal taxes during the uncertain economy we are struggling through,” Sen. Joe Lieberman, a Connecticut independent who aligns with Democrats, said Monday.

“The more money we leave in private hands, the quicker our economic recovery will be. And that means I will do everything I can to make sure Congress extends the so-called Bush tax cuts for another year,” Lieberman said.

Treasury Secretary Timothy Geithner on Monday also called on Congress to move quickly to extend the tax cuts.

Geithner and the administration have tried to make the case that conditions would have been worse without Obama’s economic policies, including the $814 billion stimulus package.

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