For some Republicans, naming an airport and an expensive new office building after former president Ronald Reagan isn't honor enough. Now, one lawmaker has started a campaign to put Reagan in the company of George Washington, Abraham Lincoln, Theodore Roosevelt and Thomas Jefferson--on the face of Mount Rushmore in South Dakota's Black Hills. Rep. Matt Salmon (R-Ariz.) this month sent his colleagues a letter asking them to sponsor an upcoming bill that would add Reagan's likeness to Mount Rushmore. "History has already vindicated Ronald Reagan's positions, and we should honor him appropriately for his achievements," Salmon said in his letter, crediting the former president with winning the Cold War and turning the economy around. The National Park Service, however, said Salmon's plan to carve Reagan's likeness into the stone will not work, according to spokesman David Barna. In 1989, the Park Service, charged with maintaining Mount Rushmore, commissioned a routine study of the monument's long-term stability and concluded the mountain cannot handle more carving or drilling. Barna said the structure is too unstable, adding that Washington's face has so many cracks that future sculpting of the mountain could worsen the situation. Salmon is not taking the administration's word for it. The Arizona Republican plans to introduce his bill Feb. 25. Reps. Roscoe G. Bartlett (R-Md.) and John R. Kasich (R-Ohio) have said they will support the proposal, according to Salmon's press secretary, Michael Paranzino. The legislation would create a nonprofit foundation to oversee the project and raise private funds for the endeavor. The foundation also would establish a commission of technical experts to determine if the mountain could handle the Reagan likeness. If the commission finds the existing monument could not withstand the drilling, Paranzino said, it would try to find another suitable site. "We've learned to take the Clinton administration with a grain of salt," said Paranzino. "We'll hire our own experts." According to the Park Service, this is not the first time people have tried to add company for the four presidents honored on Mount Rushmore. "Over the last 30 years, we have been actively lobbied by several individuals to have additional portraits added to Mount Rushmore," said Barna. In the 1950s, there was a big push to add Franklin D. Roosevelt; in the 1960s, John F. Kennedy. Barna said in the 1980s, there was even a public clamor to add Elvis. None succeeded. "This was not a government-commissioned piece of artwork; this was an individual artist doing his own thing," said Barna, adding that one would not presume to add another figure to the Mona Lisa. "This is like the works of art in the National Gallery." The artist, Gutzon Borglum, had declared that the rock on either side of the presidential busts was too deteriorated to sculpt. He died in 1941 before completing Mount Rushmore. His son, Lincoln, finished the monument. Barna said the Park Service would welcome additional studies. "We rarely have money to do a geological investigation, and because {Salmon's bill} would mean more data, which we need to learn about the stability of the structure, so yeah, let's go up and look at it." Salmon's plan was criticized by Ben Beach, spokesman for The Wilderness Society, which was in a constant battle with the Reagan administration over environmental policy. Beach said adding Reagan to Mount Rushmore would be "inappropriate" because Reagan was more interested in developing land than in protecting it. "I mean here's a guy who was trying to undermine what the national parks are supposed to be all about," Beach said. "For a guy who said that trees cause pollution, you ought to be looking at some industrial sight and not a natural area."