FILE -This combination of photos provided by the Hennepin County Sheriff's Office in Minnesota on Wednesday, June 3, 2020, shows Derek Chauvin, from left, J. Alexander Kueng, Thomas Lane and Tou Thao. Federal prosecutors asked a judge to sentence one of the four former Minneapolis police officers convicted of civil rights violations in George Floyd's killing to as many as 6 1/2 years in prison but to impose significantly stiffer sentences on two others. (Hennepin County Sheriff's Office via AP, File)