According to officials familiar with the situation, Shelton’s prepared testimony was leaked in advance to the company. And the White House asked the general to alter the testimony to add two points: that the general supported the White House policy to add more broadband for commercial use; and that the Pentagon would try to resolve the questions around LightSquared with testing in just 90 days. Shelton chafed at the intervention, which seemed to soften the Pentagon’s position and might be viewed as helping the company as it tries to get the project launched, the officials said.

“There was an attempt to influence the text of the testimony and to engage LightSquared in the process in order to bias his testimony,” Rep. Mike Turner (R-OH) said in an interview. “The only people who were involved in the process in preparation for the hearing included the Department of Defense, the White House, and the Office Management and Budget.”…

The White House confirmed Wednesday that its Office of Management and Budget suggested changes to the general’s testimony but insisted such reviews are routine and not influenced by politics. And it said Shelton will be permitted to give the testimony he wants, without any pressure…

Melanie Sloan, who runs the nonpartisan ethics groups Citizens for Responsibility and Ethics in Washington, said the emerging allegations about possible White House involvement in LightSquared’s matter seemed to mirror earlier allegations in the Solyndra case.