Nearly a decade after the US unleashed its biggest debt-issuance binge in history, made possible only thanks to the Fed’s monetization of nearly $4 trillion in deficits (and debt issuance), the Fed is starting to get nervous about the (un)sustainability of the US debt.

The Federal Reserve should continue to raise U.S. interest rates this year in response to faster economic growth fueled by recent tax cuts as well as a stronger global economy, Dallas Federal Reserve Bank President Robert Kaplan said on Wednesday.

“I believe the Federal Reserve should be gradually and patiently raising the federal funds rate during 2018,” Kaplan said in an essay updating his views on the economic and policy outlook.

“History suggests that if the Fed waits too long to remove accommodation at this stage in the economic cycle, excesses and imbalances begin to build, and the Fed ultimately has to play catch-up.” The Fed is widely expected to raise rates three times this year, starting next month.

Kaplan, who does not vote on Fed policy this year but does participate in its regular rate-setting meetings, did not specify his preferred number of rate hikes for this year. But he warned Wednesday that falling behind the curve on rate hikes could make a recession more likely.

Echoing the recent Goldman analysis, warning that the recently implemented budget could lead to an “unsustainable” debt load, Kaplan – who previously worked for Goldman – also had some cautionary words about the Trump administration’s recent tax overhaul, which he said would help lift U.S. economic growth to 2.5% to 2.75% this year, pushing the U.S. unemployment rate, now at 4.1% down to 3.6% by the end of 2018.

On the all important issue of inflation, he projected it would firm this year on route to the Fed’s 2-percent goal.

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