Dr. Oz's vote in 2018 Turkish election renews criticism

As Dr. Mehmet Oz embarks on a bid for the U.S. Senate, the television star has largely shied away from discussing his ties to Turkey, where he maintains citizenship, and dismissed criticism from political opponents that he harbors any so-called "dual loyalties."

But a photograph of Oz casting a ballot in Turkey's 2018 presidential election is rankling some national security experts -- particularly after recently saying he has "never been politically involved in Turkey in any capacity."

"The decision to vote in a foreign country's election is problematic from a security clearance perspective," according to John V. Berry, a former government lawyer with expertise in federal security clearances.

After a rocky start to his campaign, Oz recently earned a coveted endorsement from former President Donald Trump, bolstering his chances of capturing the Republican nod. But political opponents have continued to target his connections to Turkey -- a strategy the Oz campaign and others have called xenophobic smears. If elected, Oz has said he would renounce his Turkish citizenship.