Rudy Giuliani, the personal attorney for President Trump, threatened Thursday to go public with information that would expose corruption by 2020 Democratic presidential candidate Joe Biden.

“Everything I tried to tell the press last March is now coming out, and more. I will now start to reveal the evidence directly to you, the People,” the former New York mayor tweeted. “The Biden Family Enterprise made millions by selling public office. Then when Joe was Obama’s Point Man, they ALL made millions.”

Giuliani’s claim that he could reveal evidence detrimental to the former vice president follows his offer to testify in Trump’s impeachment trial taking place in the Senate.

“I would love to see a trial. I’d love to be a witness – because I’m a potential witness in the trial – and explain to everyone the corruption that I found in Ukraine, that far out-surpasses any that I’ve ever seen before, involving Joe Biden and a lot of other Democrats,” he said Sunday morning on “The Cats Roundtable” with radio host John Catsimatidis on AM 970.