Federal prosecutors have obtained an audio recording of a summer 2021 meeting in which former President Donald Trump acknowledges he held onto a classified Pentagon document about a potential attack on Iran, multiple sources told CNN, undercutting his argument that he declassified everything.

A recording of former President Donald Trump shows him acknowledging a document he kept after leaving the White House was classified, NBC News reported Thursday, citing a source directly familiar with the matter.

Trump’s remarks on that tape, recorded in 2021, indicate the document was related to Iran, NBC reported.

A new report out from CNN states that federal prosecutors for the DOJ possess a recording that shows former President Donald Trump speaking candidly about "a classified Pentagon document about a potential attack on Iran." 

CNN is primarily interested in what the existence of this recording means in terms of the DOJ case against Trump.

A statement Gen. Mark Milley, the chair of the Joint Chiefs of Staff, made during a House hearing last week on Iran's nuclear program alarmed Israeli defense and intelligence officials to the point they protested and asked the Biden administration for clarifications, four Israeli officials told Axios.

Lawmakers pressed top Pentagon officials Thursday to explain America’s ultimate goal in Ukraine, how exactly victory over Russia can be measured, and just how much money and military equipment the U.S. is willing to commit in the latest sign that the political sales job for supporting Kyiv is getting tougher by the day.

With skepticism growing in some corners of the GOP over the tens of billions of dollars sent or committed to the war, the Biden administration faces calls to define its endgame in the Russia-Ukraine war. 

The top US military officer told lawmakers Tuesday that Russia’s invasion of Ukraine likely could not have been prevented except by the presence of US forces and warned that the conflict in Europe is likely to drag on for years to come.

Gen. Mark Milley, chairman of the Joint Chiefs of Staff, said the conquest of Ukraine had been a “long-standing objective” of Russian President Vladimir Putin.

The top U.S. military officer is warning that the war in Ukraine will likely last years, raising concerns that the world "is becoming more unstable and the potential for significant international conflict between great powers is increasing, not decreasing."

During testimony in front of the House Armed Services Committee on Tuesday, Chairman of the Joint Chiefs of Staff General Mark Milley called Russia's invasion of Ukraine "the greatest threat to peace and security of Europe, and perhaps the world, in (his) 42 years of service in uniform."

The highest ranking military officer in the U.S. said Tuesday that he expects the conflict in Ukraine to last years. 

"I do think this is a very protracted conflict, and I think it's measured in years. I don't know about decade, but at least years for sure," Chairman of the Joint Chiefs of Staff General Mark Milley told the House Armed Services Committee Tuesday during testimony on the defense budget. 

A Marine lieutenant colonel who was thrown in the brig for posting videos in which he criticizes the chairman of the Joint Chiefs of Staff and other senior military leaders for their roles in the Afghanistan withdrawal will plead guilty to multiple charges at his court-martial Thursday, his attorney said.

Lt. Col. Stu Scheller is charged with disrespecting superior commissioned officers, willfully disobeying an officer, conduct unbecoming an officer, contempt for his senior leaders and violations of good order and discipline.

Top military leaders confirmed in a Senate hearing Tuesday they recommended earlier this year that the U.S. keep 2,500 troops in Afghanistan, and that they believed withdrawing those forces would lead to the collapse of the Afghan military.

Why it matters: Biden denied last month that his top military advisers wanted troops to remain in Afghanistan, telling ABC's George Stephanopoulos: "No one said that to me that I can recall."