On August 10, ABC News broadcast this story, saying a senior advisor to Donald Trump has said that Trump is considering soon making a pledge that he will not run for President outside the Republican Party. The story also says he will this week put out position papers on immigration and trade and that he is about to start campaigning in Iowa and New Hampshire.

But, later on August 10, Trump himself said he is not inclined to make that promise at this time. See this story. Thanks to Bill Van Allen for that link.