Economist Larry Summers does not like recent developments at the Internal Revenue Service (IRS), the federal agency responsible for collecting federal taxes. President Donald Trumpannounced last week that Deputy Treasury Secretary Michael Faulkender would be the acting commissioner for the IRS,

Former Treasury Secretary Lawrence Summers said that the Trump administration’s moves to downsize the Internal Revenue Service, along with other changes, are likely to incentivize reduced tax-payment compliance — potentially costing the federal government $1 trillion in lost revenues over a decade.

The former Treasury secretary envisions an avalanche of noncompliance as the federal tax agency weathers massive workforce reductions and a string of walkouts in its leadership.