Lawyers for Capital One and Deutsche Bank refused to tell a federal appeals court in New York on Friday whether they have President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's tax returns, citing "contractual obligations," according to CNN and The Washington Post.

A three-judge panel asked the banks whether documents subject to House Democrats' subpoenas for financial records might include Trump's tax filings. After repeatedly refusing to answer, the banks will file letters to the court within 48 hours on the topic, though it's unclear what the banks would say in their writings, according to the reports.

The judges questioned the banks about Trump's tax returns in the hearing for a case in which the president is challenging House Democrats' subpoenas.

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The House Financial Services and Intelligence committees issued subpoenas to the banks earlier this year for Trump's financial information. Trump's personal lawyers then filed a lawsuit in an effort to prevent the banks from turning over the documents.

In May, a federal district court ruled in favor of House Democrats. The subpoenas aren't being executed while the case is being appealed.

The lawsuit is one of a number of cases in which House Democrats are seeking to obtain Trump's financial information.

A federal appeals court in Washington, D.C., last month heard oral arguments in a case over Democrats' subpoena for Trump's financial information from the accounting firm Mazars.

And last month, Democrats filed a lawsuit in an effort to get a court to compel the Treasury Department and IRS to provide them with Trump's federal tax returns. Democrats filed a motion earlier this week seeking to expedite the case, which the administration is taking issue with.