Members of Congress from both parties are open to revisions in a Republican plan to raise $300 billion by overhauling the tax code, Democratic and Republican congressional aides said, even as lawmakers publicly rejected competing debt-cutting proposals.

Members of the supercommittee have talked about a higher top marginal income tax rate than the 28 percent proposed this week by Republican Senator Pat Toomey of Pennsylvania, a Republican congressional aide and a Senate Democratic leadership aide said in separate interviews. Democrats also want additional sources of new revenue such as ending certain corporate tax expenditures, the Democratic staff member said.

Each side is waiting for the other to make the next move, the Democratic aide said. The Republican staff member said Toomey's plan was intended as a framework and not a final offer. Neither aide was authorized to speak publicly.