Dr. Mehmet Oz, who is President Donald Trump’s nominee to lead the Centers for Medicare and Medicaid Services, may have “significantly underpaid his Social Security and Medicare taxes” in recent years,

Mehmet Oz, President Donald Trump’s nominee to lead the Centers for Medicare and Medicaid Services, avoided paying some Medicare and Social Security taxes over the course of three years by leveraging an accounting tactic that has been questioned by the government,

The memo alleges Oz avoided paying about $440,000 in these taxes by misclassifying his earnings from his media business, Oz Property Holdings LLC, according to NBC News. Democratic staffers said they asked Oz to amend his returns to reflect these earnings as taxable under self-employment rules.