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A pair of Jewish groups accused Sen. Robert Byrd (search) on Wednesday of making an outrageous and reprehensible comparison between Adolf Hitler's Nazis and a Senate GOP plan to block Democrats from filibustering. A GOP senator called for Byrd to retract his remarks.

Byrd spokesman Tom Gavin denied that Byrd, D-W.Va., had compared Republicans to Hitler. He said that instead, the reference to Nazis in a Senate speech on Tuesday was meant to underscore that the past should not be ignored.

"Terrible chapters of history ought never be repeated," Gavin said. "All one needs to do is to look at history to see how dangerous it is to curb the rights of the minority."

Sen. Rick Santorum (search) of Pennsylvania, the Senate's No. 3 Republican, called for Byrd to retract his comments, saying they "lessen the credibility of the senator and the decorum of the Senate."

Ken Mehlman, chairman of the Republican National Committee, called the remarks "poisonous rhetoric" that are "reprehensible and beyond the pale."

Abraham H. Foxman (search), national director of the Anti-Defamation League, said Byrd's remarks showed "a profound lack of understanding as to who Hitler was" and that the senator should apologize to the American people.

"It is hideous, outrageous and offensive for Senator Byrd to suggest that the Republican Party's tactics could in any way resemble those of Adolf Hitler and the Nazi Party," Foxman said.

In his comments Tuesday, Byrd defended the right senators have to use filibusters — procedural delays that can kill an item unless 60 of the 100 senators vote to move ahead.

Byrd cited Hitler's 1930s rise to power by, in part, pushing legislation through the German parliament that seemed to legitimize his ascension.

"We, unlike Nazi Germany or Mussolini's Italy, have never stopped being a nation of laws, not of men," Byrd said. "But witness how men with motives and a majority can manipulate law to cruel and unjust ends."

Byrd then quoted historian Alan Bullock, saying Hitler "turned the law inside out and made illegality legal."

Byrd added, "That is what the nuclear option seeks to do."

The nuclear option is the nickname for the proposal to end filibusters of judicial nominations because of the devastating effect the plan, if enacted, would have on relations between Democrats and Republicans.

The back and forth was the latest twist in the battle over Senate GOP efforts to free 10 nominated judges that the chamber's minority Democrats have blocked during President Bush's first term. The Senate confirmed 204 others.

The first criticism of Byrd came Wednesday when Matt Brooks, executive director of the Republican Jewish Coalition, issued a written statement.

"With his knowledge of history and his own personal background as a KKK member, he should be ashamed for implying that his political opponents are using Nazi tactics," Brooks said.

Byrd joined the Ku Klux Klan as a young man and has repeatedly apologized for it. Now 87 and the Senate's longest-serving member at 47 years, he prides himself on his knowledge of history and makes historical references frequently during debates.

Brooks also attacked as "disgusting" Byrd's remark that "some in the Senate are ready to callously incinerate" senators' rights to filibuster. The comment came amid several references by Byrd to the "nuclear option."

"There is no excuse for raising the specter of the Holocaust crematoria in a discussion of the Senate filibuster," Brooks said. "That kind of political heavy-handedness is inappropriate and reprehensible."

Byrd is a long-standing defender of the chamber's rules and traditions, many of which help the Senate's minority party.

"In the Senate, when a majority runs roughshod over the minority, the people's liberties can be in danger," Gavin said. "That majority may be a majority of one party or a majority of one region or a majority of one interest.

Brooks said his group's counterpart, the National Jewish Democratic Council, should condemn Byrd's comments. Ira Foreman, executive director of the Democratic group, declined to comment.