Donald TrumpDonald John TrumpAlaska Republican Party cancels 2020 primary Ukrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' MORE held a raucous rally Monday night in New Hampshire, branding rivals Jeb Bush a "schlub" and Ted CruzRafael (Ted) Edward CruzState Department's top arms control official leaving Sanders NASA plan is definitely Earth first Trump judicial picks face rare GOP opposition MORE "the Canadian," with fans yelling out jokes about erection pills.

At one point in the rally, the presidential contender was complaining about the pharmaceutical company Pfizer's recent "inversion" deal to ship its profits overseas. A fan shouted out, "No more Viagra," referring to the fact that Pfizer manufactures the erection drug. Trump paused the rally and asked him to shout it out again, saying he thought it was very funny.
 
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Trump brutally mocked the former Florida governor, ridiculing his poll numbers and the millions spent by Bush's super-PAC Right to Rise. Trump also ridiculed Bush for using his mother in the campaign.

"Your mother is not going to help you negotiate with China," Trump said.

But it was the real estate mogul's chief rival, Cruz, who caught the brunt of the attacks at the rally at Farmington High School, N.H. 
 
The billionaire repeatedly raised the birther issue against Cruz, whom Trump and his fans now refer to as "the Canadian."
 
Trump, who is leading by nearly 20 points in national polls but is in a close race with the senator in Iowa, was so intent on raising the issue of Cruz's Canadian birthplace that he even managed to link it to the development of the Keystone pipeline.
 
"That pipeline goes from Canada — the birthplace of Ted Cruz — to Texas, where he's a senator," Trump said.
 
"Is something going on there?" Trump asked, adding that he thought Cruz might have a "conflict of interest" on the pipeline due to his Canadian origins.
 
The birther issue, in which Trump raises the possibility that Cruz does not qualify to be president under the "natural born" clause of the Constitution, is now the billionaire's preferred line of attack against the Texan, whose popularity among evangelicals makes him a formidable opponent in Iowa.
 
Trump's fans appear to be catching on to the attacks. All Trump needed to do was mention Cruz's name, early in the rally, and a supporter in the crowd shouted out, "the Canadian." 
 
"The Canadian," Trump repeated, approvingly. "The man from Canada."