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California's governor denounced in starkly personal terms a federal judge's upending of the state's restrictions on assault weapons as officials announced the filing of a formal notice that they will appeal the decision.
They described last week's ruling by US District Judge Roger Benitez as an outlier that conflicts with at least six other federal decisions upholding assault weapons laws in California and elsewhere, a ruling that is designed to get the issue before a recently more conservative US Supreme Court.
Governor Gavin Newsom, the son of a judge, denounced Judge Benitez as "a stone cold ideologue".
"He is a wholly owned subsidiary of the gun lobby of the National Rifle Association," Mr Newsom said.
The state already is appealing the same judge's 2017 ruling against the state's nearly two-decade-old ban on the sales and purchases of magazines holding more than 10 bullets, and his ruling last year blocking a 2019 California law requiring background checks for anyone buying ammunition.
"We need to call this federal judge out. He will continue to do damage, mark my word," Mr Newsom said.
"This is a very focused agenda to work through this judge, where the decision's already made before it's even presented, who writes 'press releases' on behalf of the gun lobby."
Gun owners' rights groups have made no secret of their effort to get firearms restrictions before the nation's high court.
But the Firearms Policy Coalition, which led plaintiffs who won at the trial level, condemned the governor's "outrageous and callous personal attacks" on the judge.
"Newsom's verbal assaults on a long-respected member of the judiciary shows his deep and continuing disrespect for the rule of law, the judiciary, the Constitution, and the human rights of California citizens," the group said.
Judge Benitez was appointed by Republican President George W Bush, and Mr Newsom, a Democrat, also assailed Republicans who don't support gun restrictions.
A three-judge appeals court panel agreed with Judge Benitez on his ammunition magazine ruling, but the decision is being reconsidered by a larger appellate panel.
Attorney General Rob Bonta filed the three-page notice of appeal and plans to ask the Ninth US Circuit Court of Appeals for a stay so the current 32-year assault weapons ban will remain in effect throughout the appeals process.
Judge Benitez ruled on Friday that the state's definition of illegal military-style rifles violates the US Constitution because it deprives law-abiding Californians of weapons commonly allowed in most other states.
Critics of the ruling including Mr Bonta and Mr Newsom were particularly upset with the judge's comparison of assault weapons to a common tool: "Like the Swiss Army knife, the popular AR-15 rifle is a perfect combination of home defence weapon and homeland defence equipment. Good for both home and battle," the judge wrote.
"Pocket knives were not intended to kill as many people as possible," said Mattie Scott, Brady California state president, whose 24-year-old son was killed with an assault weapon in 1996.
State officials announced their appeal at San Francisco General Hospital, a Level I Trauma Centre, where trauma surgeon Dr Andre Campbell vividly described the damage that can be done by a high-speed rifle round fired from an assault weapon.
"An AR-15 is a weapon of mass destruction ... used in warfare," Dr Campbell said.
"(It) causes absolute devastation to the human body. It is as if a bomb went off in the tissues of the patient."
California first banned specific brands of weapons in 1989 after a mass shooting at a Stockton elementary school killed five children and injured more than two dozen others.
The state has updated the law several times since then and overall has some of the nation's strictest firearms laws.
As a result, "we have one of the lowest gun death rates in the entire country," said Robyn Thomas, executive director of the Giffords Law Centre to Prevent Gun Violence.
The Firearms Policy Coalition said it will oppose any stay of Judge Benitez' order. It had argued in part that assault weapons are no more deadly than some other weapons that are not banned by the state.
"The State's desire to continue imposing its ban should not be allowed to prevail over the fundamental rights of law-abiding gun owners," the group said.
Mr Newsom and Mr Bonta, both Democrats, are long-time supporters of what they term common-sense gun restrictions. The governor likely faces a recall election this fall largely driven by his handling of the coronavirus pandemic. Mr Bonta took office in April to fill a vacancy and faces several more conservative challengers in next year's election.
Their move was backed earlier by 10 Democratic state lawmakers who said the restrictions help control gun violence.
Democrats who control the state Assembly revived for future consideration a bill that would raise taxes on the sale of guns and ammunition.
The bill requires a two-thirds vote because it would raise taxes, and last week it failed to muster enough votes.
It would impose a 10 per cent tax on the sales price of handguns and an 11 per cent tax on the sales price of rifles, precursor parts and ammunition, using the money for gun violence prevention and recovery programs.