Both Cruz and Trump were campaigning on Monday in New Hampshire, which holds the second contest in the country's primary season.

The war of words between Cruz and Trump has intensified in recent days, with Trump going on the offensive over Cruz's eligibility to be on the ballot given his Canadian birth and for Cruz's failure to disclose loans received from Citibank and Goldman Sachs for his 2012 Senate race in Texas.

Trump on Sunday called Cruz a 'nasty guy' who no one likes. Cruz tried to turn the insult into a joke yesterday, posting a message on Twitter saying Americans feel 'nasty' toward the 'Washington Cartel.' Cruz posted a link to the video of Janet Jackson's hit song 'Nasty'.

Polls show Cruz and Trump locked in a tight race in Iowa, whose Feb 1 caucuses lead off the state-by-state presidential nominating contests. But Trump is polling considerably better in New Hampshire.

Cruz embarked on a five-day swing through New Hampshire this week as his numbers began to show new strength.

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