Donald Trump plans to sign a pledge saying he won’t run as a third party candidate, RealClearPolitics reported Thursday.

The billionaire businessman, who boasts twice the support in the polls as his closest competitor, caused a stir in August when he told Fox News’ Bret Baier that he wouldn’t rule out an independent candidacy:

But while it looks like he’s doing just that, his campaign manager told Politico that nothing is certain:

“I don’t think you can ‘expect’ ANYTHING from Mr. Trump.”

The pledge reads, according to Politico:

“I [name] affirm that if I do not win the 2016 Republican nomination for president of the United States I will endorse the 2016 Republican presidential nominee regardless of who it is … I further pledge that I will not seek to run as an independent or write-in candidate nor will I seek or accept the nomination for president of any other party.”

A Trump associate told Politico that the change of heart comes because Trump feels like Republicans have treated him fairly, as well as wanting to be sure he doesn’t have any issues getting on ballots in primary states…

Source: The Republican Party Wants Trump to Sign a Special ‘Loyalty Pledge’ – Now The Donald Has Decided