”Grassley

WASHINGTON (CNN) — The FBI is celebrating its’ 100th anniversary Saturday, but it is unlikely that Sen. Charles Grassley, R-Iowa, will be sending a card or baking a cake. Grassley remains one of the bureau's harshest critics in Congress.

While the Iowa senator is quick to praise agents in the field, he says, over the years that when problems crop up at the FBI, "It's been when headquarters has been interfering with the local agents."

Grassley charges that the FBI remains locked in turf battles with other federal law enforcement agencies such as the Bureau of Alcohol Tobacco and Firearms and Immigrations and Customs Enforcement.

FBI Director Robert Mueller has repeatedly told Congress that the bureau has greatly improved its information sharing and cooperation with other federal agencies since the Sept. 11 terrorist attacks. But Grassley says the bureau still has a "Pac-Man mentality" — intent on gobbling up the jurisdiction of other agencies.

Listen: Grassley talks with CNN radio about the FBI

Grassley concedes the FBI deserves credit, because there's not been another terrorist attack on U.S. soil since 2001, but the senator also insists there's room for the FBI to transform itself from a crime-solving agency into one that is capable of averting terror threats of the 21st Century.

Democrats on Capitol Hill are pushing for a crackdown on oil price speculators Tuesday.

WASHINGTON (CNN) – Senate Democrats say one way to lower oil prices is to crackdown on oil price speculators — investors who trade in oil contracts aiming to profit from changes in prices.

But Republicans are skeptical. Senate Republican Charles Grassley of Iowa charges that Democrats' demands to curb speculating is a "fig leaf" to avoid more drilling for oil in the United States.

The Senate is facing a test vote on a Democratic bill that would reign in excessive oil price speculation.

Grassley says it the "right thing" to further regulate oil speculating but he says Congress needs a much more balanced approach including more U.S. oil exploration and development; greater conservation and more use of alternative fuels including ethanol. Much of the nation's ethanol production comes from corn grown in Grassley's home state.

Listen: Sen. Grassley talks to CNN Radio

Democratic Senator Byron Dorgan of North Dakota, one of the main sponsors of the bill to stop excessive oil price speculating, estimates that "as much as 20 to 30 to 40 percent of the current price could be taken off if you got rid of excessive speculation."