The survey finds Trump with 45 percent support and Clinton with 40 percent.
He says the U.S. should offer to take in at least 65,000 of the refugees by 2016.
Rebecca Shabad 09/04/15 01:41 PM EDT
Cruz plans to send the letter to Mitch McConnell early next week.
"I’m sorry this has been confusing to people," she said.
The former secretary of State has not had such low numbers since 1992, Gallup says.
"The time to put pressure on them is now," the 2016 candidate said.
Two longtime backers of Biden have signed on with the group.
Both Clinton and GOP candidate Marco Rubio will be in Puerto Rico Friday afternoon.
Kerry said he sees no evidence that Hillary Clinton mishandled classified information.
The emergence of an alternative to the eventual nominees could upend the 2016 presidential race.