Rival Republican presidential candidates piled on Donald Trump Saturday for his caustic remarks about a female debate moderator, and the billionaire celebrity candidate backpedaled in an effort to keep his campaign from unraveling.

Trump blasted Fox News anchor Megyn Kelly during a debate in Cleveland on Thursday when she questioned him about insulting comments he had made about women. The backlash to his exchange with Kelly has threatened to knock the wheels off the bandwagon of support that had Trump leading early polls in the race for the Republican nomination for the 2016 election.

Asked about Kelly on a CNN interview on Friday, Trump said: "You could see there was blood coming out of her eyes. Blood coming out of her wherever."