Daniel Hale is scheduled to be sentenced Tuesday after pleading guilty to violating the Espionage Act by leaking top secret documents.
Siddiqui was a Pulitzer Prize-winning photographer who was embedded with the Afghan special forces when he was killed.
Many who worked with the U.S. have said they fear for their lives, worrying about retaliatory attacks from the Taliban.
America is winding down its 20-year military presence as Taliban insurgents gain territory in Afghanistan.
“I will not send another generation of Americans to war in Afghanistan.” President Joe Biden announced the 20 year-long military mission in Afghanistan will end by Aug. 31.
“Just one more year ... is not a solution but a recipe for being there indefinitely," the president said of America's longest-running war.
Afghans who worked with Americans have said they fear for their lives after President Biden announced the withdrawal of U.S. troops by September.
“The United States of America started this journey and should end this journey responsibly,” said a former Afghan interpreter.
Veterans reflect on the mission that America ignored — and that many of them are still paying for.
No one immediately claimed responsibility for the attack.