WASHINGTON (AP) — For months, President Donald Trump’s former lawyer Michael Cohen tried — but failed — to position himself as a whistleblower in the vein of Watergate hero John Dean.

As the time ticked down toward his deadline to report to prison, Cohen also lost the interest of the one group of people who could help him out: the federal prosecutors he desperately hoped would ask a judge to shorten his sentence.

Since mid-March, prosecutors in New York have rebuffed Cohen’s repeated offers to provide more information about alleged wrongdoing by Trump and other people in his orbit, Cohen’s attorney Lanny Davis told The Associated Press on Friday.

“Why not see him?” Davis asked. “What’s the downside? He’s about to go to prison.”

Cohen’s legal team reached out to prosecutors in March asking for an opportunity to meet for a “frank discussion” about reducing his sentence, based on his cooperation. That meeting never happened.

That snub might be the best evidence yet that Cohen’s months-long campaign to sell himself as a potential witness hasn’t paid off.

Cohen is scheduled to report Monday to a federal prison 70 miles north of New York City to begin serving a three-year sentence for campaign-finance violations, tax evasion, bank fraud and lying to Congress.

In an apparent bid to maintain a semblance of normalcy before starting his sentence, Cohen left his Manhattan apartment building on Saturday with his son to go to a coffee shop and then to a barbershop, Eddie Arthur Salon. They both got haircuts. Cohen’s next stop was the pricy retailer Barneys New York, where he told journalists that he plans to hold a news conference Monday before heading to prison.

Cohen remains the only person charged in a scandal involving hush money payments to the porn star Stormy Daniels and Playboy model Karen McDougal, who were threatening during the presidential campaign to speak up about alleged affairs with Trump.