Following Donald Trump's proposal to close off "parts of the Internet," Professor Thomas Ristenpart, a member of the Cornell Tech Security Group, spoke with TIME about why that's not such a great idea.

Without such a switch, Trump would have to convince others to help him close off the Internet. Preventing ISIS operatives abroad from going online at all would be impossible — the group already controls Internet infrastructure in its territory; it has used this power to ban some citizens from getting online. Even if Trump somehow convinced a head of state to cut off their country’s Internet in the name of security, the move would overwhelmingly affect people unassociated with ISIS. “It would be a human rights catastrophe,” says Thomas Ristenpart, a computer science professor at Cornell University.

Read the full article on TIME.