Business mogul Donald Trump gives a speech as he announces his candidacy for the U.S. presidency at Trump Tower on June 16, 2015 in New York City. (Photo by Christopher Gregory/Getty Images)

NEW YORK (CBSNewYork/AP) — He’s in! Real estate mogul Donald Trump on Tuesday officially announced his candidacy for the 2016 Republican presidential nomination.

Trump made the announcement to a rally of cheering supporters gathered at Trump Tower on Fifth Avenue Tuesday morning.

“I am officially running for president of the United States and we are going to make our country great again,” he told the crowd of hundreds. Many were wearing T-shirts that said “Make America Great Again” and holding signs saying “I Believe In Trump!”

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He’s the 12th high-profile Republican to enter the 2016 race, with more to come in the weeks ahead.

“All of my life, I have heard, a truly successful person, a really successful person, and even a modestly successful person, cannot run for public office, just can’t happen,” Trump said. “Yet that’s the kind of mindset you need to make this country great again.”

As CBS2’s Dick Brennan reported, Trump got off right away running, bragging, bashing and trash-talking his way into the Republican race. He has big plans, but little use for what politicians have done in America.

“How stupid are our leaders? How stupid are they to allow this to happen?” he said. “We have people that are stupid. We have people that aren’t smart. We have losers. We have people that don’t have it. They don’t have a clue. They can’t lead us.”

One thing Trump said he has is money — and lots to spend.

“I’m not using donors, I don’t care,” he said. “I’m really rich.”

And Trump did lay out a very clear agenda:

“I will be the greatest jobs president that God ever created. I tell you that,” he said. “I’ve employed tens of thousands of people over my lifetime.”