MINNEAPOLIS—Prosecutors and defense attorneys for three former Minneapolis officers who are charged in the death of George Floyd asked a judge on Friday to postpone their state trial while a federal civil rights trial goes forward. Thomas Lane, J. Kueng, and Tou Thao are scheduled to go to trial on March 7 on state charges of aiding and abetting both murder and manslaughter. The three also face a federal trial on Jan. 20 on charges alleging they violated Floyd’s civil rights while acting under government authority. State prosecutors and defense attorneys filed a joint request Friday to have the state trial postponed, saying it’s not known how long the federal trial will last. The request says all parties agree that “a continuance should be granted in the interest of justice.” They are asking for an informal conference to set a new trial date. It’s not known when Judge Peter Cahill …