Best Lines of the Republican Debate in Michigan

— -- The Republican presidential candidates lobbed attacks at each other in Detroit tonight, as they offered their final pitches to Michigan voters ahead of next week's primary.

The debate, hosted by Fox News, welcomed GOP front-runner Donald Trump back to the stage after missing the previous Fox debate.

And GOP hopeful Ben Carson was missing after announcing Wednesday he sees no "political path forward."

Here are the best lines of tonight's debate:

Donald Trump

ON MITT ROMNEY:

"Well, look, he was a failed candidate. He should have beaten President Obama very easy. He failed miserably, and it was an embarrassment to everybody, including the Republican Party."

"He wants to be back in the game," Trump added.

Romney, who was the GOP presidential nominee in 2012, called the New York real estate mogul a "phony" and a "fraud" this morning.

ON DAVID DUKE:

"I totally disavow the Ku Klux Klan. I totally disavow David Duke," Trump said.

“By the way, if you look at my Twitter account almost immediately after the [CNN] program, they were disavowed again."

ON MARCO RUBIO'S "SMALL HANDS" COMMENT:

"He hit my hands. Nobody has ever hit my hands. I have never heard of this," Trump said. "Look at those hands. Are they small hands? And he referred to my hands if they are small, something else must be small. I guarantee you there is no problem. I guarantee you."

ON HILLARY CLINTON:

“I have not started on Hillary yet. Believe me, I will start soon. I haven't even started,” Trump argued.

ON IMMIGRATION:

“I will say though, in terms of immigration and almost anything else, there always has to be some, you know, tug and pull and deal,” Trump said.

ON RELEASING OFF-THE-RECORD AUDIO OF NEW YORK TIMES INTERVIEW:

“No. I never do that. I would not do that, I have too much respect," Trump said.

Rubio shot back: “First of all...that's not up to The New York Times. That's up to you, Donald."

Ted Cruz chimed in: “Release the tapes. What are you hiding in the tapes?”

Trump retorted: “Excuse me, I have given my answer, lying Ted."

ON CHANGING HIS "TUNE:"

“I was very much, like, okay, by the time I went back and studied it and they were talking about bringing thousands and thousands [migrants], I changed my tune. And I don't think there's anything wrong with that,” the real estate mogul said.

When asked about writing in his book, in 2000, where he writes about opposing gun control, but supporting ban on assault weapons. Trump responded: “I don't support it anymore. I do not support the ban on assault.”

ON FOREIGN POLICY:

“We're going to build up our military and get the equipment we want, not the equipment that's sold to us by somebody that gave him and him and not the governor campaign contributions. Okay?”

ON SUPPORTING GOP NOMINEE:

"Even if it's not me?" Trump quipped. "Yes, I will."

Marco Rubio

ON TRUMP'S PERSONAL ATTACKS:

"Trump has mocked everybody with personal attacks. He has done so to people sitting on the stage today," the Florida senator said, referring to the feud between Trump and Fox News host Megyn Kelly. "He has done so about people that are disabled. He has done it about every other candidate in this race. So if there's anyone who's ever deserved to be attacked that way it's been Donald Trump."

Trump's response: "I also happen to call him a light weight, okay. And I have said that. So I would like to take that back. He is really not that much of a light weight."

ON TRUMP'S TRADE POSITION:

“He can start tonight by announcing that all the Donald Trump clothing will no longer be made in China and in Mexico but will be made here in the United States,” Rubio said.

Trump fired back, “This little guy has lied so much.”

“Here we go,” Rubio retorted. “You ask him about the economy and the first thing he does is launch an attack about some 'little guy' thing. Because he doesn't have answers."

ON THE SECOND AMENDMENT:

“The second amendment as I said before is not a suggestion. It's the constitutional right of every American to protect themselves and their families.”

ON TRUMP V. CRUZ:

“When they're done with the yoga, can I answer a question?” the Florida senator joked.

“I really hope we don't see yoga on this stage,” Cruz added.

“He's very flexible, so you never know,” Rubio said.

ON TRUMP'S POLICY REVERSALS:

There's a difference between flexibility and telling people whatever you think you need to say to get them to do what you want them to do," Rubio said.

“Once again, he was pressed on a policy issue to show his understanding of the foreign policy and his reaction was to attack somebody else with a name.”

ON SUPPORTING TRUMP AS THE GOP NOMINEE:

"I will support the Republican nominee."

Ted Cruz

ON TRUMP: