WASHINGTON —  House Democrats, insistent that they will hold lawmakers to higher standards, decided Tuesday that Rep. William Jefferson will not return to an influential committee until a federal corruption investigation involving him is completed.

Speaker-to-be Nancy Pelosi said the Democratic Steering Committee had resolved that Jefferson, who last Saturday won a runoff election in his New Orleans district, will not be given back his spot on the Ways and Means Committee, the panel that determines tax and trade policies.

At Pelosi's urging, the House last June stripped Jefferson of his committee assignment because of the corruption investigation that included an FBI document asserting that agents had found $90,000 in bribe money in the Louisiana Democrat's freezer.

Pelosi has promised to make lobbying and ethics reform a top priority when she becomes speaker next month, and the Jefferson case has been cited as an early challenge.

Jefferson, the first black member of Congress from Louisiana since Reconstruction, has denied any wrongdoing, and the Congressional Black Caucus has questioned the idea of punishing him before his legal case has been settled.

While depriving Jefferson of his committee assignment, the Democrats have been mum about another member of the Ways and Means Committee, Rep. James McDermott, who on Monday was admonished by the House ethics committee for violating ethics standards by giving reporters access to an illegally taped telephone call involving Republican leaders a decade ago.

Pelosi must also make a decision about Rep. Alan Mollohan of West Virginia, who is in line to become chairman of an Appropriations subcommittee that oversees the FBI. Mollohan faces questions about personal business deals.

Jefferson also holds a seat on the House Budget Committee. It was unclear if he would retain that seat in the next Congress.