House Speaker Jim Wright, D-Texas, denies he violated any ethics rules in the publication of a book, but calls continue to mount for an investigation of his finances and dealings with federal regulators.

The latest demand for an investigation came from Frank Fahrenkopf, chairman of the Republican National Committee, who also Thursday challenged Democratic presidential front-runner Michael Dukakis to support his call for appointment of an independent counsel to investigate Wright.Fahrenkopf's statement came one day after the liberal group Common Cause asked the House ethics committee to investigate allegations that donations to Wright's re-election campaigns may have been used improperly to pay for publication of a book written by Wright.

Wright issued a statement denying that any campaign funds were used for the book.

He said House rules "clearly authorize" members to receive such royalties.