Senator Ted Cruz was booed during his Colbert appearance but the host came to his defense.
Carly Fiorina showed the American people a side of her they have not seen as she sang on The Tonight Show.
The tough-talking candidate for the Republican nomination wowed Jimmy Fallon with a song she sings to her dog, Snickers, who doesn't like to go on walks.
She parodied the classic "Rock Around The Clock" and sang: “I'd rather stay right here at home instead. I want to lie back down in my nice warm bed. My name's Snick and you're going to have to carry me.”
Read: Donald Trump Under Fire For Failing to Correct Supporter Who Called Obama a Muslim
She also had a zinger for Donald Trump comparing him with Russian PM Vladimir Putin.
“Vladimir Putin is saying he wants to meet with Trump when he comes here. You've met Putin. The two of them have a lot in common actually, we'll just leave it at that,” she sang.
Trump fired back telling Fox News' Greta Van Susteren that Carly Fiorina gives him a headache.
Trump said: "Frankly, if you hear her for periods of time you get a great big beautiful headache. I've seen this and I’ve watched it. She was a total and complete disaster.”
Meanwhile, another Republican candidate, Ted Cruz, sat down with Stephen Colbert on The Late Show.
The host warned his audience not to boo the senator as Cruz was explaining his opposition to the Supreme Court ruling on gay marriage.
Cruz said: “I believe in democracy,” after Colbert asked him about his marriage views.
The senator was met with a chorus of boos, but Colbert came to his defense, telling the audience: “No, no, no, guys however you feel he's my guest, so please don't boo him.”
Read: Was Man Who Asked Trump Muslim Question Planted to Embarass Him?
Also on the defensive was Dr. Ben Carson, who doubled down on his statement that he wouldn't advocate having a Muslim president.
Sean Hannity asked him if he stands by what he said to NBC’s Chuck Todd on Sunday where he said he would not advocate putting a Muslim in charge.
Carson told Hannity: “Absolutely, I stand by the comments. We have to recognize that this is America and we have a constitution and we do not put people at the leadership of our country whose faith might interfere with their carrying out the duties of the constitution. I don't care if you are a Christian.”
Watch Below: Jimmy Fallon Shows Injured Finger Without Bandage For First Time
