DETROIT — President Obama used a boisterous Labor Day rally to put congressional Republicans on the spot, challenging them to place the country’s interests above all else and vote to create jobs and put the economy back on a path toward growth. “Show us what you’ve got,” he said.

In a partial preview of the jobs speech he will deliver to Congress on Thursday night, Obama said roads and bridges nationwide need rebuilding and more than 1 million unemployed construction workers are itching to “get dirty” making the repairs. He portrayed Congress as an obstacle to getting that work done.

“I’m going to propose ways to put America back to work that both parties can agree to, because I still believe both parties can work together to solve our problems,” Obama said at an annual Labor Day rally sponsored by the Detroit-area AFL-CIO. “Given the urgency of this moment, given the hardship that many people are facing, folks have got to get together. But we’re not going to wait for them.

“We’re going to see if we’ve got some straight shooters in Congress. We’re going to see if congressional Republicans will put country before party,” he said.

Congress returns from its summer recess this week, and the faltering economy and jobs shortage are expected to be a dominant theme.

Besides spending on public works, Obama said he wants pending trade deals passed to open new markets for U.S. goods. He also said he wants Republicans to prove they’ll fight as hard to cut taxes for the middle class as they do for profitable oil companies and the wealthiest Americans.

The president is expected to call for continuing a payroll tax cut for workers and jobless benefits for the unemployed. Some Republicans oppose extending the payroll tax cut, calling it an unproven job creator that will only add to the nation’s massive debt. The tax cut extension is set to expire Jan. 1.

Republicans also cite huge federal budget deficits in expressing opposition to vast new spending on jobs programs.

But Obama said lawmakers need to act – and act quickly. “The time for Washington games is over. The time for action is now,” he told a supportive union crowd that Detroit police said was in the thousands. The event at a General Motors Corp. parking lot in the shadow of the automaker’s headquarters building had the sound and feel of a campaign event, with the union audience breaking into chants of “Four More Years” throughout the president’s 25-minute speech.

Obama could be including himself in that call for action. His remarks came as he’s facing biting criticism from the GOP for presiding over a persistently weak economy and high unemployment. Republicans dubbed him “President Zero” after a dismal jobs report last Friday showed that employers added no jobs in August, which hasn’t happened since 1945. The unemployment rate, meanwhile, remained unchanged at 9.1 percent.

The report sparked new fears of a second recession and injected fresh urgency into Obama’s efforts to help get the unemployed back into the labor market – and improve his re-election chances.