Donald Trump has been ordered by a US judge to cooperate with the discovery process mandated for his lawsuit against the BBC and to sit for a deposition by 11 December – or else he could be subject to sanctions, including the possible dismissal of the $10bn lawsuit.

The lawsuit stems from a Panorama documentary aired by the BBC that spliced together comments made by Trump during a rally on 6 January 2021, before the US Capitol riot. While the broadcast was not readily available to view in Florida, Trump’s team has argued that he was personally damaged by the broadcast under Florida’s Unfair and Deceptive Trade Practices Act.

During a lengthy hearing dealing with a variety of discovery issues, federal magistrate judge Enjoliqué Lett on Thursday also rejected a request by Trump’s legal team to prevent the seven-hour-long deposition from being videotaped, though it will only be accessible to attorneys in the case.

Lett agreed with contentions from the BBC’s lawyers that Trump’s team had not been sufficiently forthcoming in handing over internal documents relevant to the case ahead of an 18 December deadline for discovery.

“We still have a completely lopsided [situation] here on discovery. They have produced absolutely nothing of any substance,” attorney Charles Tobin, on behalf of the BBC, argued in a Miami courtroom. The documents that Trump’s team have turned over have primarily been either pulled from the internet or provided by the BBC itself.

“It strains credulity that a thorough search has been done in order to determine that all of these requests have been responded to,” Lett told Alejandro Brito, Trump’s Florida-based attorney. “The court is not satisfied that anyone is doing a thorough job.”

The judge gave the plaintiffs 30 days to produce the relevant documents. While she acknowledged that the discovery process can be “burdensome” on both parties, she said that “failure to do so could result in sanctions, including possible dismissal of the suit for failure to prosecute the case and engage in meaningful discovery process”.

Of the Trump team’s obligation to adequately participate in the discovery process, the judge said: “This is the last opportunity to do so.”

After discussing the discovery process, the judge turned to the BBC’s request to compel the president’s team to agree for a deposition, after a previously scheduled date – 16 October – was cancelled for what Trump’s counsel said were “other matters of national importance”. While the BBC argued that Trump was actually campaigning in Georgia on that day, Brito said the president was “involved in a host of things” on a daily basis that the BBC’s legal team “has no idea” about.

While Lett said she was obligated to adhere to the discovery schedule mandated in the case, that timeline could be extended by district court judge Jeffrey T Kuntz. Tobin, representing the BBC, said his side is willing to push back the timeline for Trump’s deposition if Kuntz adjusted the discovery schedule.

Lett once again threatened sanctions – including dismissal – if Trump’s team did not comply with her deposition order.