Then the Pharisees went and made a plot to entrap him in argument.

They sent some Pharisees and Herodians to him to entrap him in argument.

plotting to entrap him in something he might say.

Yet I hold it somewhat against you that you have among you some adherents of the teaching of Balaam, who taught Balak to entrap the children of Israel into eating meat that had been sacrificed to idols, and into immoral practices.