Derek Chauvin, the white ex-policeman convicted of murdering African-American man George Floyd, asked Tuesday for a new trial on claims of jury and prosecution misconduct. The 45-year-old -- who knelt on Floyd's neck for more than nine minutes in Minneapolis -- faces up to 40 years in prison after being found guilty last month in a case that prompted a national reckoning on racial injustice and police brutality. Chauvin's attorney Eric Nelson argued that his client did not get a fair trial due to publicity around the case, court and prosecution errors, as well as "race-based pressure" on the jury.