(Sacramento, CA) -- U.S. Senator Ron Wyden of Oregon is among a group of senators calling for an investigation into the high gas prices on the West Coast. The Democrat joined California Senator Dianne Feinstein and Senator Maria Cantwell of Washington state in sending a letter to the Federal Trade Commission urging the agency to investigate what the senators called elevated and volatile prices for gas, diesel and jet fuel. Specifically, the senators want the FTC to focus on trading practices which may have affected fuel prices in Western states. The lawmakers say they're concerned about the disparity between the high prices at the pump and the now declining price of crude oil.