Republican presidential front-runner Donald TrumpDonald John TrumpSupreme Court comes to Trump's aid on immigration Trump is failing on trade policy Trump holds call with Netanyahu to discuss possible US-Israel defense treaty MORE had a message to his critics at a massive, sold-out rally in Dallas on Monday: "I'm not going anywhere."

"I'm not going anywhere, and we're not going anywhere," Trump told a packed American Airlines Center, where an estimated 20,000 rallied.

"We are killing it. They mentioned a little while ago about the silent majority — it's back. And it's not silent. Maybe we should call it the noisy, aggressive, wanting to win — wanting-to-win majority."

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Trump said he is preparing for the second Republican presidential debate on Wednesday and offered frequent criticism to his rival, former Florida Gov. Jeb Bush.

"Who would you rather have negotiating — Jeb or Trump?" Trump asked.

Trump, who continues to lead his Republican rivals by wide margins, said he will unveil a tax policy plan in about three weeks, reiterating that he wants to lower taxes for middle income Americans while raising taxes on hedge fund companies. He hasn't said how he'll pay for it.

Trump said he would be able to negotiate a deal with Congress to lower corporate taxes on international companies, who have changed their corporate headquarters to overseas addresses to take advantage of lower rates.

Trump criticized President Obama's Iran deal and again called for the government to build a wall at the U.S.-Mexico border to stop illegal immigration.

"[Secretary of State John Kerry] actually may go down worse than Hillary Clinton, because he made this deal," Trump said. "They didn't read 'The Art of the Deal,' " he said, referencing his best-selling business book.

Trump didn't attack fellow political outsiders Carly Fiorina and Ben Carson, both of whom are also vying for the nomination and have seen a bump in the polls. In some Iowa and New Hampshire polls, Carson polls just below Trump.

"I like Carly and I like Ben — and I like many of the people I'm running against ... but nobody is going to be able to do the job that I'm going to be able to do," Trump said.

But he pulled no political punches on Republican strategist Karl Rove.

"He's terrible. He still thinks Mitt Romney won," Trump said. "This guy raised last cycle, the last presidential election — he raised $434 million and didn't win one race."