Former UFC lightweight and featherweight champion Conor McGregor has taken a new turn in his current standoff with UFC president Dana White.

McGregor and White have taken swipes at one another from afar over the past several days, with McGregor leaking DMs from White which detailed his thoughts about potential fights over the rest of the year, while White took umbrage with private conversations going public.

Monday, McGregor went on a Twitter tangent which began by jumping into the replies of an ESPN tweet but then veered in another direction. “Notorious” invited former UFC interim lightweight champion Dustin Poirier – who recently ran into a dead end attempting to get better pay from White in order to fight Tony Ferguson – to fight and donate the proceeds to charity, with no promotional involvement from the UFC.

He then went on to name a time and place.

Poirier, who lost to McGregor via first-round TKO at UFC 178 in 2014 in what was a moment that signaled to the world the up-and-coming McGregor was legit, gave a thumbs up to the offer, naming his charity, The Good Fight Foundation, as one of the beneficiaries.

The chance of this fight actually happening under the proposed parameters are slim, given the UFC is highly unlikely to release either from their contracts for a fight outside their promotion, even if it is for charity. Still, the offer seemingly indicates McGregor is serious about wanting to fight.

The challenge to Poirier came after McGregor took exception to an ESPN segment in which Daniel Cormier questioned how committed McGregor was to fighting anyone.