GOP presidential candidate Ted Cruz just got a major boost for his campaign after getting the support of mega-donor Dick Uihlein. The Illinois businessman donated $1 million to Cruz's political action committee, per CNN.

"He is one of the top five courted GOP donors. For us to land him is a good shot in the arm for Ted, and it really sets the stage going into Iowa," super PAC official with Keep The Promise PAC, Drew Ryun, said.

Uihlein is the founder of Uline shipping company and one of the top Republican mega-donors in the U.S. He previously donated $2.5 million to Wisconsin Gov. Scott Walker's campaign via the super PAC Unintimidated.

Cruz is using an anti-establishment outsider to bring in significant donations from both small and well-known people. The Texas senator has already received a lot of money from mega-donors in his home state including billionaire brothers Farris and Dan Wilks, private equity investor Toby Neugebauer and Houston Texans owner Bob McNair.

According to a report from the New York Times, the Wilks brothers who made millions from fracking, donated $15 million, the most for any donors since the campaign started. Neugebauer, son of Texas Republican Representative Randy Neugebauer, contributed $10 million which is third most while the McNair family gave $2 million.

The 45-year-old also raised $20 million in the fourth quarter of last year according to his campaign officials. His campaign manager Jeff Roe said in a memo to Cruz's supporters that their campaign's fundraising total for 2015 amounts to $45 million, up from the $26 million raised for the first three quarters of the year, per the Wall Street Journal.

"We have a network in place with the resources required to win that is the envy of every other campaign," Roe said. He added that Cruz received donations from about 300,000 donors from across the U.S. and that money came from 66 percent of the zip codes in America.

The Texas Senator told his supporters at a conference call to start 2016 that he could win the Republican race in the next three months. He also told his volunteers to get ready for negative advertising starting this January.

"There is a very good possibility that the Republican primary will be decided by the end of March. Strap on the full armor of God. We ain't seen nothing yet," Cruz said as quoted by the Texas Tribune. The latest question on his campaign is if Cruz is a natural-born U.S. citizen.

Cruz was born in Canada to an American mother and a Cuban father with her mother living in the United States for at least ten years with five of those years coming after the age of 14, thus making Cruz a natural citizen, per the New York Daily News.