The United States Senate is expected to consider an amendment today that would allow individuals with concealed weapons permits in one state to carry their concealed weapons into other states.

From this AP article:

Backers, led by Sen. John Thune, R-S.D., say truckers and others with
concealed weapons permits should be able to protect themselves when
they cross into other states. Opponents say the measure would force
states with strict procedures for getting permits to accept permits
from states with more lax laws.

It is an interesting issue that brings up questions of state rights in addition to gun rights.