Trump said he is in good company as a former Democrat.
The poll showed neighboring Gov. Scott Walker of Wisconsin dropping even further.
The new rules likely will help Carly Fiorina get on the stage.
The visits from the 2016 hopefuls come as the island faces a $70 billion debt crisis.
Coons said Biden deserves the "time and the space" to make a decision on whether to run.
Trump sought to mend fences with the prominent Hispanic business leader.
AFL-CIO chief Richard Trumka said there was still time for Biden to enter.
The 2016 presidential contender is walking back talk of a northern border wall.
Bush's campaign has released a video on the “liberal things that Trump believes.”
Mario Trujillo 09/01/15 11:03 AM EDT
Steve Wozniak gave a boost to Bernie Sanders's presidential campaign on Tuesday.