Federal prosecutors on Tuesday recommended that Michael Flynn, the first Trump national security adviser, receive a prison sentence for lying to FBI agents in the Russia investigation, abandoning their earlier support for leniency after the retired Army lieutenant general hired new lawyers who turned from cooperating to clashing with the government.

Coming just weeks ahead of his sentencing in Washington’s federal trial court, the prosecutors’ reversal provided the latest indication of how Flynn’s relationship with the government soured in the two years since he pleaded guilty to lying about his contacts with the Russian ambassador to the United States. The government recommended zero to six months in prison for Flynn.