Former US president Donald Trump has vowed to build a "state of the art" Iron Dome missile defence system over the United States if he is reelected.

"We'll build an Iron Dome over our country, a state of the-art missile defence shield, and it's all state of the art," he told supporters at a rally in Rochester, New Hampshire on Sunday.

During the rally, Trump urged supporters to secure a decisive victory for him in New Hampshire at Tuesday's caucuses.

"Get your neighbours, get your family, get everybody you got to vote because we have to win by big margins," he said.

"We have to let them know this is a movement. You know, this is the greatest movement in the history of politics of this country."

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