If Donald Trump's intention is to protect American lives as he says, then I think his words and actions are totally misdirected.

In the last decade 24 Americans have been killed by acts of terrorism, in the same period 280,024 have died from gun violence committed by their own citizens.

http://www.politifact.com/truth-o-meter/statements/2015/oct/05/viral-image/fact-checking-comparison-...

Even if you factor in the figures for the 9/11 attacks, since 2001 terrorism has killed 3,380 US citizens while domestic gun violence has killed 406,496.

 http://edition.cnn.com/2015/10/02/us/oregon-shooting-terrorism-gun-violence/

Seems to me that Americans need protecting from themselves more than from terrorists.