Washington (CNN) Senate Democrats pressed Treasury Secretary Steven Mnuchin about his financial holdings on Thursday, calling on the former financier to explain why there have been delays in certifying his required ethics disclosures.

The government's chief ethics watchdog agency has yet to certify Mnuchin's 2018 financial disclosure, which was filed more than eight months ago.

The delay in certification of Mnuchin's forms by the Office of Government Ethics was first reported last week by the nonprofit Center for Public Integrity

Sen. Ron Wyden, the top Democrat on the Senate Finance Committee, asked the Treasury secretary at the Senate Finance hearing whether he had completely shed his interest in film production company, StormChaser Partners, founded by his wife, Louise Linton.

"What we have wondered is if there has been an exchange of an asset for a loan rather than a divestment," Wyden asked.

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