Pornography publisher Larry Flynt is offering "up to $10 million" to anyone who produces information that leads to US President Donald Trump's impeachment and removal from office.
He lays out the offer in a full-page ad in the Sunday edition of The Washington Post.
During last year's presidential campaign, Flynt dangled $US1 million to anyone who could turn over video or audio capturing Trump behaving in an illegal or sexually demeaning manner.
That followed the release of the 2005 Access Hollywood video in which Trump bragged of imposing himself on women.
In Sunday's ad, Flynt asks for any "smoking gun" that is fit to publish and drives Trump from office.
The ad states: "The attempt to impeach Donald Trump will strike many as a sour-grapes plot by Democrats to overturn a legitimate election.
"But there is a strong case to be made that the last election was illegitimate in many ways - and that after nine tumultuous months in office, Trump has proven he's dangerously unfit to exercise the extreme power accrued by our new 'unitary executive'.
"Impeachment would be a messy, contentious affair, but the alternative - three more years of destabilizing dysfunction - is worse.
"Both good Democrats and good Republicans who put country over party did it before with Watergate.
"To succeed, impeachment requires unimpeachable evidence. That's why I'm making this offer: Buried in Trump's top-secret tax returns or in other records from his far-flung investments there may be a smoking gun."
The White House didn't comment.
