WASHINGTON (TNND) — Dr. Mehmet Oz, President Donald Trump's pick to lead the Centers for Medicare and Medicaid Services, will testify before the Senate Finance Committee on Friday.

Trump selected the former television talk show host and prominent physician in November to fill the role on his Cabinet.

He called Oz an "eminent Physician, Heart Surgeon, Inventor, and World-Class Communicator," noting he would work closely with Roberty F. Kennedy Jr. and the Department of Health and Human Services.

"I have known Dr. Oz for many years, and I am confident he will fight to ensure everyone in America receives the best possible Healthcare, so our Country can be Great and Healthy Again!" Trump shared in a statement.

Republicans, who have coalesced around Trump's nominees for the health agencies, are likely to ask Oz about his plans for Medicare and Medicaid, including the Trump administration's focus on eliminating fraud from the $1 trillion programs.

Democrats, meanwhile, will question Oz's tax filings, which they say show he has used a tax code loophole to underpay taxes by thousands of dollars on Medicare, the program he'll oversee. They will also grill Oz on any cuts he would make to health insurance coverage as well as comments on his TV show supporting privatized Medicare.

The U.S. Office of Government Ethics has done an “extensive review” of Oz's finances, spokesman Christopher Krepich said in a statement about Oz’s taxes. He added that the office has indicated “any potential conflicts have been resolved and he is in compliance with the law.”

Oz’s net worth is between $98 million and $332 million, according to an analysis of the disclosure, which lists asset values in ranges but does not give precise dollar figures. His most recent disclosure shows he also holds millions of dollars worth of shares in health insurance, fertility, pharmaceutical and vitamin companies. He has promised to divest from dozens of companies that would pose conflicts for him as the CMS administrator.

His hearing comes after Senate committees voted to advance nominations of Marty Makary, poised to lead the Food and Drug Administration, and Jay Bhattacharya, set to helm the National Institutes for Health, for a full Senate vote.

The nomination of David Weldon to lead the Centers of Disease Control and Prevention was withdrawn just before his hearing on Thursday.

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Editor's note: The Associated Press contributed to this article.