Topeka ? Two senators at the center of the investigation into Kansas Supreme Court Justice Lawton Nuss may refuse to appear before a House investigative committee, their attorney said Monday.

The House panel will meet Wednesday and Thursday as part of its probe into a conversation between Nuss and Senate President Steve Morris, R-Hugoton, and Sen. Pete Brungardt, R-Salina.

Nuss spoke with the legislators over lunch March 1 about school finance, a pending matter before the court. He has apologized for the conversation and removed himself from more deliberations in the school finance lawsuit.

But the House is investigating the matter, and the judicial disciplinary board is considering charges that Nuss violated the state’s judicial code of ethics.

State Rep. Mike O’Neal, R-Hutchinson, chair of the House panel, has asked Morris and Brungardt to appear before the committee to testify.

But Sen. John Vratil, R-Leawood, and an attorney representing Morris and Brungardt, said that may not happen.

Vratil said under the Kansas Constitution, no legislator is required to answer for his speech or reasons for votes.

“It’s a very significant principle in both the U.S. and state constitutions,” he said. But Vratil said no final decision has been made yet. House Speaker Doug Mays, R-Topeka, acknowledged “we’re negotiating.”

On another front, a group called Kansas Judicial Watch called for the resignations or impeachment of all members of the Kansas Supreme Court.

Richard Peckham of Andover, chairman and general counsel of the group, pointed to Nuss’ written response last week to the ethics charges. In that response, Nuss said he asked Morris and Brungardt about the funding total of a proposed school finance bill.

“Justice Nuss’s monitoring of this house bill was consistent with the court staff’s practice of providing regular written reports to the court regarding proposed school funding bills during the 2005 legislative session,” Nuss’ attorney argued.

The response also noted each justice received a copy of an education cost-study that was not part of the legal record on appeal of the case.

Peckham said justices are not supposed to be gathering information on their own separate from what has been entered into the record of the case.

Vratil called Kansas Judicial Watch a “fringe group.” Peckham said the group, which is supported by the Kansas Taxpayers Network, anti-abortion advocates and gun rights groups, wants to replace the so-called merit selection of judges with election of judges.