On Thursday, after Michael D. Cohen revealed new information about the Trump Organization’s business dealings with Russia, President Trump called his former personal lawyer a liar.

“He is a weak person,” Mr. Trump told reporters at the White House. He added: “Very simply, Michael Cohen is lying.” He was referring to Mr. Cohen pleading guilty to lying to Congress about a real estate deal to build a tower in Moscow.

But Mr. Trump, who is identified as “Individual 1” in court documents that accompanied Mr. Cohen’s admission, was himself less than forthcoming about the prospective real estate project during the 2016 campaign.

At no time did Mr. Trump disclose that the Trump Organization had entered negotiations for the property, known as the Moscow Project. And evidence presented in the documents filed on Thursday contradicts Mr. Trump’s repeated denials of his financial interests in Russia and his playing down of campaign contacts with Russian officials .