WASHINGTON â€"  Under pressure to take action on rising gasoline prices, President Obama wants Congress to strengthen federal supervision of oil markets, increase penalties for market manipulation and empower regulators to increase the amount of money energy traders are required to put behind their transactions. 

The White House plan, which Obama was to unveil Tuesday, is more likely to draw sharp election-year distinctions with Republicans than have an immediate effect on prices at the pump. The measures seek to boost spending for Wall Street enforcement at a time when congressional Republicans are seeking to limit the reach of federal financial regulations. 

Obama plans to spell out his $52 million proposal Tuesday at the White House, where he will be joined by Attorney General Eric Holder. 

Republicans have been hammering Obama on his energy policies, recognizing the political cost of high gas prices on the president. Obama's plan would turn the tables on Republicans by taking aim at Wall Street's role in the oil price chain. 

Senior administration officials who put together the proposal said it aims to detect and deter illegal manipulation by energy speculators, the type of practices that many Democrats blame for the high cost of gasoline. The officials spoke on the condition of anonymity to discuss the plan ahead of Obama's announcement. 

They would not go as far as to say that market manipulation is responsible for rising gas prices, but the officials said they wanted to curtail the ability of speculators to take unlawful advantage of oil price volatility. 

At issue is the increasing role of investment in oil futures contracts by pension funds, mutual funds, hedge funds, exchange traded funds and other investors. Much of that money is betting that oil prices will rise. Analysts say it is possible that such speculation has somewhat inflated the price of oil. 

At the same time, investors can also bet that prices will go down -- indeed, speculators have been credited for low natural gas prices. Studies of the effects of speculation on oil markets indicate that it probably increases volatility, but doesn't have a major effect on average prices. 

Still, seeing a potential problem with speculators is not limited to Obama or Democrats or this election season. When gasoline hit $3 a gallon in 2006, George W. Bush launched an investigation, declaring Americans "don't want and will not accept ... manipulation of the market. And neither will I." Last year, as prices rose, Obama and Holder announced the creation of a task force to look into fraud in the energy markets.