Former Treasury Secretary Larry Summers is knocking the Treasury Department for downplaying the threat of inflation a day after Secretary Janet Yellen said he was “wrong” about out-of-control prices.

Summers, a Democrat who served as treasury secretary under President Bill Clinton and director of the National Economic Council under President Barack Obama, has been sounding the alarm on inflation since earlier this year. He argues that increased demand coupled with an infusion of fiscal spending and large-scale Federal Reserve debt purchases has put the United States at risk of losing control of inflation.