Donald Trump and Jeb Bush share one thing in common that could decide everything in the 2016 race for the White House: an abysmal 13-point favorability rating.

According to a just released Gallup Poll, billionaire developer Donald Trump has plunged in the polls among GOP voters in the 7-day period following the Sept.16 Republican presidential debate.

During that time, Trump’s favorability rating has fallen significantly from a 32 percentage point lead for GOP voters who view him favorably versus those who view him unfavorably to just 13 points, the analysis shows.

Former Florida Gov. Jeb Bush, who continues to struggle for support from conservatives who make up the bulk of Republican primary voters also holds a 13-point favorability rating.

Ben Carson’ favorables scored a 63-point margin on his unfavorables during the same time, Gallup said. His surge came at the time of his repeated assertions, first surfacing on “Meet the Press,” that a Muslim should not be president.

Meanwhile, Carly Fiorina has a 38-point favorability rating.

Read More: Gallup: Trump Favorability Erodes, Carson Gains – NewsMax