Democrats in the House are blocking the Ethics Committee so they can protect their own, Speaker Dennis Hastert told Sean Hannity.
"There's a reason that they don't want to go to the ethics process and as long as they can keep someone dangling out there like they have with Tom DeLay, they take great glee in that," the Illinois Republican said.
The following update was on CNN.
Three sources close to House GOP leaders said the Democrats being targeted include Pelosi, of California, Rep. Jim McDermott of Washington, Rep. Stephanie Tubbs Jones of Ohio and Rep. Paul Kanjorski of Pennsylvania.
Pelosi was fined by the Federal Election Commission in November 2002 for improperly operating two political action committees.
McDermott has been the subject of a long-running court case triggered by a 1998 eavesdropping incident involving Rep. John Boehner, R-Ohio.
The Washington Times reported House documents show a 2001 trip Tubbs Jones took to Puerto Rico was improperly paid for by lobbyists. A spokeswomen for Tubbs Jones denied the charge and blamed the documentation on "human error."
Republicans say charges against Kanjorski date to 1998, when the 11-term congressman helped two Pennsylvania-based companies owned and run by his four nephews and daughter by earmarking more than $9 million in federal contracts and grants for the two firms.
Kanjorski insisted he has not profited personally from those deals. The companies, Cornerstone Technologies and Pennsylvania Micronics, research water-jet technology.
Kanjorski's controversial ties to the companies nearly resulted in House GOP leaders filing ethics charges against him in 2002.