In a shot across the bow ahead of Tuesday’s first Democratic debate, Sen. Bernie Sanders (I-Vt.) on Saturday highlighted a more than decade-old difference he has with Hillary Rodham Clinton: their votes on the Iraq war.

Sanders, who voted against authorizing force in 2002 as a member of the House of Representatives, issued a press release focused entirely on that decision and how it bolsters the case for his foreign policy judgment.

The release, which did not mention Clinton by name, said the U.S.-led invasion "destabilized the region and is now considered one of the worst foreign policy blunders in the history of the United States."

Clinton's vote for the war as a U.S. senator representing New York dogged her throughout her 2008 presidential primary campaign against then-Sen. Barack Obama. Clinton, who became secretary of state in the Obama administration, eventually said she was "wrong" in her 2014 memoir, "Hard Choices."

Sanders has repeatedly spoken in similar terms on the campaign trail about his judgment on Iraq, being careful not to mention Clinton. But the contrast is implicit -- and the timing of the release Saturday raised eyebrows.

The release begins this way: "With instability in the world putting a focus on foreign policy, U.S. Sen. Bernie Sanders’ campaign on Saturday said his record shows that he has the judgement and experience to make foreign policy decisions in the best interests of the United States and our allies."

The release then directs readers to an October 2002 floor speech by Sanders against the war, highlighting his arguments against it. Among them: "that the war in Iraq would jeopardize the effectiveness of the war on al-Qaida and international terrorism" and that there would be "unintended consequences of the war" and about who would govern Iraq after Saddam Hussein was overthrown.

Sanders has said in recent days that his "consistency" on issues is one of his strong suits. That assessment comes as Clinton has taken flak for evolving positions on a number of issues, including the Keystone XL oil pipeline and the Trans-Pacific Partnership trade deal. Expect the Iraq war to be on that list on Tuesday night as well.