At a Tuesday news conference outside the White House, President Donald Trump waved a folded piece of paper before reporters’ eyes, claiming it was a secret deal he’d struck with Mexico. However, he offered no details on its contents.

Shortly after, former Vice President Joe Biden knocked the theatrical display, saying that those who suffer under the weight of the president’s tariffs want to know.

“President Trump is bringing his secret one-page agreement with Mexico to Iowa,” the 2020 Democratic candidate tweeted. “The Iowans being crushed by his tariffs would like to see it.”

Trump, who headed to Iowa for the state’s Republican Party fundraiser that evening, said the agreement is “very long and very good,” The New York Times reported. He did not say when it would go into effect ― only that it would when he wants it to.

“I am going to let Mexico do the announcement at the right time,” he said.

Washington Post photographer Jabin Botsford caught a photo of the piece of paper, which he shared on Twitter, noting that it states “the Government of Mexico will take all necessary steps under domestic law to bring the agreement into force with a view to ensuring that the agreement will enter into force within 45 days.”

It remains unclear whether the document, which clearly has two signatures dated June 7, is an official agreement.