Liberty

In the United States, it is not automatically legal to carry a firearm in a concealed manner just because one has a firearms license. One needs to obtain a special additional permission to do so. Like most things in the United States, Concealed Carry is decided on a state-by-state basis, meaning a person's permission for Concealed Carry only applies in the state it in which it was issued.

Concealed Carry Reciprocity is the legal concept that a permission for Concealed Carry, issued in any state, applies in all states. So, if a gun owner was permitted to Concealed Carry in Oklahoma, he can currently only do so in Oklahoma. Doing it in any other state is a crime. Under Concealed Carry Reciprocity, it would not be.

What does Donald Trump intend with this?

Donald Trump knows that his most loyal followers live in deep red states, which also have the highest concentrations of gun owners. Due to the high concentrations and due to Republicans being generally against gun control, it is likelier that more gun owners in red states have Concealed Carry permission. Donald Trump wants to allow people to Concealed Carry in any state if they've received permission in one, because he knows that most people who will take advantage of this will be his most loyal followers.

Donald Trump plans to lay the groundwork for his version of Mussolini's Blackshirts and Hitler's Brownshirts, his own paramilitary force of loyal followers who are ready to attack and murder fellow citizens in open daylight for their political positions that oppose their idol. Concealed Carry Reciprocity makes it easier for them to do this.