Cardinal Karl Pearce said they were there to fight for freedom. He said the Government's intentions with the TPPA were disingenuous and they were already putting bills before parliament to have the process "streamlined".
Throughout his campus visit, Key took several selfies with students and spoke to them on the concourse.
He did not address any of the protesters nor did he react to their comments.
Professor Jeff Sluka said the TPPA was "exactly" the kind of agreement that had caused economic problems.
"These free trade agreements are the cornerstone of this ... this is going to allow corporations to create jobs offshore for low wage slaves in third world countries."
He said pharmaceutical companies were only interested in making a profit and the TPPA was going to safeguard them in their "gouging".
"What about the baby boomers? The demand for healthcare is going up ... this agreement is literally evil. It will harm the people who need these things the most."
A roadshow promoting the agreement began in Auckland on Monday. Trade minister Todd McClay said the TPP was the most widely consulted free trade agreement in New Zealand's history.