Unemployment is at a nine-year low because people aren’t looking for work, according to Federal Reserve Chair Janet Yellen.

“The unemployment rate fell to 4.7 percent in May, but that decline mainly occurred because fewer people reported that they were actively seeking work,” Yellen told Senators on the Banking, House, and Urban Affairs Committee on Tuesday morning. “A broader measure of labor market slack that includes workers marginally attached to the workforce and those working part-time who would prefer full-time work was unchanged in May and remains above its level prior to the recession.”

Low economic participation has long plagued the Obama administration. The Bureau of Labor Statistics, which publishes the monthly unemployment estimates, does not count people who have given up on looking for work in its official unemployment figures, which can artificially lower the rate at which people who want work have found it. The labor agency’s newest estimates show that the participation rate is lower than at any point in the last nine years, in part due to the retirement of Baby Boomers.

Yellen’s comments, which also included an update on the Federal Reserve’s cautious approach to raising interest rates, are just the latest economic analyses undermining the Obama administration’s claims that its policies have led America’s tepid recovery since the worst recession in three generations.

Earlier this month, President Obama did a victory tour in Elkhart, Indiana, touting successes he told a cheering crowd resulted from his 2009 economic stimulus package and other policies during the seven-and-a-half years he has been in office.

“Over the past six years, our businesses have created more than 14 million new jobs — that’s the longest stretch of consecutive private sector job growth in our history,” said Obama. “We’ve seen the first sustained manufacturing growth since the 1990s. We cut unemployment in half, years before a lot of economists thought we would.”

Likewise, the White House published a graphic touting the drastically lower unemployment rate in Elkhart and nationally since Obama took office.

However, May’s unemployment drop was juxtaposed with just 38,000 jobs added – far less than the approximately 150,000 jobs needed to replace workers who retire or otherwise leave the workforce each month. U.S. productivity growth is at a five-year record low, and the first quarter of 2016 saw negative productivity growth, according to the Bureau of Labor Statistics (BLS). Overall economic growth has also been dismal, with one Forbes contributor projecting growth could be less than two percent during Obama’s final months in office.