"I do not expect any of Trump's billionaire cronies to rat him out, but I am confident that there are many people in the know for whom USD 10 million is a lot of money," he said in the ad.
The porn magazine founder noted that he had used million dollar cash rewards before to elicit information that helped upend the careers of two Republican politicians.
"For the current crisis, I have upped the ante to USD 10 million," he wrote. "Make no mistake, I fully intend to pay this entire sum."
It goes on to question the legitimacy of Trump's election and lists offenses ranging from Trump's alleged collusion with Russian meddling in the US election to his sabotaging the Paris climate accord.
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"But most worrisome is that, long before climate-change apocalypse strikes, Trump might trigger a nuclear world war," he wrote.
"Impeachment would be a messy, contentious affair, but the alternative - three more years of destabilising dysfunction - is worse."
The ad lists an email contact and a hotline, which the Post reported would be staffed on weekdays, 8:30 am to 6 pm, for the next two weeks.
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