LONDON (AP) — The BBC asked a U.S. court for help in getting documents and testimony from members of U.S. President Donald Trump ‘s family in connection with his $10 billion defamation lawsuit against the British broadcaster, a court document showed.

Lawyers for the BBC argued that Ivanka Trump, her husband Jared Kushner, and Donald Trump, Jr. have “personal knowledge” and likely have records relevant to elements of Trump’s claims against the broadcaster, according to a filing Friday in federal court in Florida.

The broadcaster has been unable to serve subpoenas because the three have Secret Service protection and other security personnel around them, the filing says.

Trump filed the lawsuit in December seeking $10 billion in damages from the BBC, accusing it of defamation as well as deceptive and unfair trade practices.

The allegations center on the way a 2024 documentary edited a speech Trump gave on Jan. 6, 2021, before protesters attacked the Capitol in Washington. The lawsuit accuses the BBC of “splicing together two entirely separate parts of President Trump’s speech” to “intentionally misrepresent the meaning of what President Trump said.”

It added that the editing was “a brazen attempt to interfere in and influence” the 2024 U.S. presidential election.

The BBC has apologized to Trump for the misleading edit, but said it had not defamed him.

The latest court filing said that Trump’s family members had knowledge of issues that were relevant to Trump’s argument “that it would be materially false to imply that he incited violence” on Jan. 6, 2021.

It cited that Donald Trump, Jr. and Ivanka Trump were both present in the Oval Office when Trump was still revising his speech, adding that Donald Trump, Jr. spoke directly with his father after violence had broken out at the Capitol.

The filing says the BBC asked Trump to accept the subpoenas on his daughter and son-in-law’s behalf or to direct the Secret Service to allow the subpoenas to be served, but he refused. The broadcaster asked the court to allow the subpoenas to be served by email and certified mail.

The judge has given Trump’s legal team until Friday to respond to the BBC’s request.

Trump’s legal team said that “the BBC is simply trying to distract away from their own obvious liability.”

“The BBC intentionally defamed President Donald J. Trump, and now the BBC is seeking to harass him, his family, and supporters by abusing the deposition process,” according to the team.

A trial has been provisionally set for February in the case.