"Our polling consistently showed that by staying on the ballot in the battleground states, I would likely hand the election over to the Democrats, with whom I disagree on the most existential issues," Kennedy said just before endorsing Trump, Insider reports.

Three key states have dug in and are refusing to remove his name;

Michigan - a key battleground state, said it was too late for Kennedy to withdraw as the nominee of the Natural Law Party.

Wisconsin - whose Elections Commission voted 5-1 on Tuesday against removing his name, citing a law which says "any person who files nomination papers and qualifies to appear on the ballot may not decline nomination."

Colorado - which, while less competitive for Trump than Michigan or Wisconsin, also refused to remove Kennedy's name.

"Minor party candidates cannot withdraw, so his name will remain on the ballot in the November election," said Cheri Hardmon, a spokesperson for Michigan Secretary of State in a statement to the Detroit News.

"The Natural Law Party held their convention to select electors for Robert Kennedy Jr. They cannot meet at this point to select new electors since it's past the primary," she added.

Nevada notably allowed RFK Jr. to remove his name after his legal team came to an agreement with DNC lawyers who were suing to keep him off the ballot.

As The Conservative Treehouse notes;

RFK Jr is gone from ballots in the battleground states of Arizona, Pennsylvania and now Nevada.  Not Michigan and Wisconsin.

Florida, Texas and Ohio have also removed Kennedy, but those are generally Red.

The state to watch is now North Carolina, where ballots would have to be reprinted quickly if the RFK Jr intent is to withdraw.  The Kennedy team have not requested to remove their candidate from North Carolina.