John McCain tore up the script for his Republican National Convention on Sunday, ordering the cancellation of all but essential opening-day activities as Hurricane Gustav churned toward New Orleans.

“This is a time when we have to do away with our party politics and we have to act as Americans,” he said as fellow Republicans converged on their convention city to nominate him for the White House.

On the eve of his convention, McCain positioned himself as an above-politics, concerned potential president determined to avoid the mistakes made by President Bush three years ago. “I have every expectation that we will not see the mistakes of Katrina repeated,” he said.

Bush and Vice President Cheney scrapped plans to address the convention on Monday, and McCain’s aides chartered a jet to fly delegates back to their hurricane-threatened states along the Gulf Coast. Campaign manager Rick Davis said the first-night program was being cut from seven hours to two and one half.

A scheduled Monday appearance by first lady Laura Bush and McCain’s wife Cindy was also canceled, NBC News reported.