CUSHING, Okla. (AP) — President Barack Obama firmly defended his record on oil drilling Thursday, ordering the government to fast-track an Oklahoma pipeline while accusing Congress of playing politics with a larger Canada-to-Gulf Coast project.

Deep in Republican oil country, Obama said lawmakers refused to give his administration enough time review the controversial 1,170-mile Keystone XL pipeline in order to ensure that it wouldn't compromise the health and safety of people living in surrounding areas.

"Unfortunately, Congress decided they wanted their own timeline," Obama said. "Not the company, not the experts, but members of Congress who decided this might be a fun political issue decided to try to intervene and make it impossible for us to make an informed decision."

Facing fresh criticism from Republicans who blame him for gas prices near $4 a gallon, Obama announced Thursday that he was directing federal agencies to expedite the southern segment of the Keystone line. The 485-mile line will run from Cushing, Okla., to refineries on Texas' Gulf Coast, removing a critical bottleneck in the country's oil transportation system. The directive would also apply to other pipelines that alleviate choke points.

"Anyone who says that we're somehow suppressing domestic oil production isn't paying attention," Obama said, speaking at the site of the new Oklahoma project.

Shawn Howard, a spokesman for TransCanada, said the company welcomed Obama's support for the Oklahoma-to-Texas portion of the pipeline but couldn't say whether his involvement would impact the timeline for completing the project.

Construction is expected to begin in June with completion next year.

Republicans said the moves were little more than a publicity stunt.

"The American people can't afford more half-measures on energy from the president," said Kirsten Kukowski, a Republican National Committee spokeswoman. "No matter what he says, the reality is he killed the Keystone pipeline and the energy production and 20,000 jobs that went with it."

Environmentalists were also critical of Obama's move. Susan Casey-Lefkowitz of the Natural Resources Defense Council said it was "downright foolhardy to cut corners on safety reviews for permitting" the Texas-to-Oklahoma line, "especially when the industry has a history of oil spills."

Obama's order urges speedy review of the Cushing project and directs federal agencies to incorporate previous environmental studies of the Keystone proposal that included the southern route.

The use of previous studies should help move the project forward more quickly than if a review of the project started from scratch, although it's unclear exactly how much time the expedited review will save.

Republicans call the president's actions a belated attempt to take credit for a project over which he has relatively little control. While federal agencies play a role in the approval process for the domestic portion of the pipeline, states have a more direct say in approving the route.

The full Keystone pipeline became a political flashpoint late last year when congressional Republicans wrote a provision forcing Obama to make a decision and environmental groups waged a campaign to kill the project. Obama delayed the project in January.

Obama has been highlighting his energy agenda this week in Nevada, New Mexico, Oklahoma and later Thursday in battleground Ohio, a trip that reflects the degree to which high gas prices have begun hitting consumers in their pocketbooks.

Before a boisterous crowd at Ohio State University, Obama said his administration had shown a commitment to drilling all over the nation, then mocked his critics again, saying he did have his limits. "I'm not drilling in the South Lawn," he said. "We're not drilling next to the Washington Monument."

In the midst of his prepared comments, Obama was unusually sharp in admonishing a protester who was interrupting his speech. The president told the man that he would read the book he was apparently offering but said: "Show me some courtesy."

For Obama's advisers, rising gas prices pose a threat to his re-election bid because they could undermine the benefits of a payroll tax cut that he made the centerpiece of his jobs agenda last fall — Congress approved the tax cut extension in February — and throttle the economic recovery.

Republicans view rising gas prices as emblematic of Obama's energy record and hope to tag him with the blame even though no president has much control over prices at the pump. Gas prices have risen more than 50 cents a gallon since January.

GOP presidential hopeful Rick Santorum, campaigning at a Harvey, La., company that services oil rigs, said Obama's administration should open more federal lands for leases to boost U.S. oil production and revenue for the federal government.

"Here's an opportunity for us in this country to do something about it: increasing jobs, lowering energy prices, decreasing the deficit, all of the things you would think the president of the United States would be for," Santorum said.

Mitt Romney, Santorum's chief rival for the Republican nomination, has labeled Obama's top energy advisers the "gas hike trio," urging the president to fire three Cabinet secretaries because of the high prices.