Can you still visit the countries listed under Trump's travel ban?

(NEXSTAR) — People from a dozen countries will soon be barred from entering the U.S., while those from seven others face expanded travel conditions, after President Donald Trump signed a travel ban on Wednesday.

The ban, which Trump said was brought on by national security concerns, takes effect on Monday, June 9, and is similar to an order issued during his first term. Additional countries may also be added to the list "as threats emerge around the world," Trump said in a video posted Wednesday.