I have never commented on whether the U.S. is safe of not. What I have said several times is that it's the prerogative of two or more states, as we see in the European Union, to enter into those agreements to manage in the best way possible their borders and, eventually, irregular entries. What matters is that in both countries, or in all those countries participating in a safe third agreement, people have access to a fair asylum process and that, ultimately, they are not returned to countries where they face torture or death.
On July 24th, 2018. See this statement in context.