President Barack Obama will visit Gulfport and Theodore today as part of a two-day visit to the Gulf Coast to see areas affected by the BP oil spill.

Obama is scheduled to arrive on Air Force One this morning at Gulfport/Biloxi International Airport.

He is expected to tour a U.S. Coast Guard command center and meet with local officials and south Mississippi residents.

Obama is set to travel to Alabama later today and tour a Coast Guard command center in Theodore. His trip will conclude Tuesday morning in Pensacola, where he is scheduled to address military personnel at Naval Air Station Pensacola.

The visit marks Obama's fourth trip to the Gulf Coast since the Deepwater Horizon oil rig exploded in the Gulf on April 20. His three previous trips have been to Louisiana, and the visits to Alabama and Mississippi will be his first as president.

Obama made campaign stops in the two states during his 2008 run for president.

Gov. Bob Riley and Mississippi Gov. Haley Barbour said they would be on hand to welcome Obama to their respective states. Riley on Sunday expressed frustration with the Obama administration for its handling of the oil spill crisis.

"I guess the biggest concern I have ... is this, quote, 'unified command,'" Riley said Sunday during an appearance on CNN's State of the Union talk show with Candy Crowley. "What we have is a committee. It's a committee that essentially consists of all of the different federal agencies sitting down here, and as a committee, each one has a veto over whatever policies we have."

The White House said Sunday that Obama would make a major address to the nation on Tuesday following his trip.

The speech from the White House is expected at 7 p.m. CDT Tuesday and will last about 15 minutes, the White House confirmed.