"If we are attacked, somebody attacks us, wouldn't you rather have Trump as president if we're attacked?" he said at a rally in Milford, N.H. "We'll beat the shit out of them."
He added that America needs to stop "playing games."
"We've become the policemen to the entire world," he said. "We take care of the world. They pay us peanuts."
Trump said under him, the U.S. would get along better with Russia and other countries.
"We can use them to knock out ISIS with us so that maybe we don’t always have to pay for it,” he said. 
“Knock the hell out of them, but let them drop some of their bombs that cost $1 million apiece, let them use some of their weapons that cost billions of dollars," Trump added.
"Let them beat the shit out of ISIS also.”