I have a friend who refused to answer any questions at the border. They took him in for 6 hours of additional questioning, which he refused to answer. And they let him through. So they have no legal right to require you to answer any questions, but they have procedural authority to make your life difficult.
I have a friend who refused to answer any questions at the border. They took him in for 6 hours of additional questioning, which he refused to answer. And they let him through. So they have no legal right to require you to answer any questions, but they have procedural authority to make your life difficult.