Hurricane Gustav is forcing the GOP to consider major convention changes.

(CNN) — McCain campaign manager Rick Davis plans to meet with Republican officials in charge of the party's convention planning in Minneapolis-St. Paul Sunday to review the latest news on Hurricane Gustav and discuss what their options might be — then consulting with the presumptive Republican nominee to determine what changes may need to be made.

"I wouldn't call it a nightmare, but it is a very perplexing challenge," said a GOP official planning the event.

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A senior McCain source tells CNN they are considering turning the convention into a service event — a massive telethon to raise money for the Red Cross and other agencies to help with the hurricane.

"He wants to do something service oriented if and when the storm hits and it’s as bad as its expected to be now," said this McCain source.

They are also hoping to get McCain himself to a storm-affected area as soon as possible.

Earlier, John McCain had suggested to a FOX News interviewer that the convention could be suspended if it seemed a festive gathering was inappropriate in light of the potential destruction the storm may bring.

Republican Governors Bobby Jindal of Louisiana, Charlie Crist of Florida, Haley Barbour of Mississippi and Rick Perry of Texas — all states which lie in the path of Gustav, currently a Category 4 hurricane — will all skip the GOP convention because of the storm.

The storm has already forced last-minute changes in the convention's announced schedule: If the convention — originally scheduled to start Monday — commences by Tuesday, former Massachusetts Governor Mitt Romney's speech will likely move to that night from Wednesday. Other changes are being contemplated this afternoon.

The hardest decisions — like whether to cancel a day or two of the four-day gathering, or to or condense days — will be made at the last second, say GOP officials. But the logistics of those decisions are already being discussed.

There are two scenarios under consideration for President Bush's speech, currently slated for Monday night. If the president is on hand to speak, his wife Laura will give a short speech. If he is not, the first lady will give a longer speech, while the president himself speaks via satellite from the White House or a location affected by the storm. That decision will likely not be made until Sunday evening, or perhaps Monday.

Officials won't discuss in detail how McCain's plans might change, but say he is likely to go Monday and/or possibly Tuesday to an aid station in an area hit by the hurricane, if its intensity continues as expected.