Final answer:
Allowing the NSA to monitor communication between US citizens and possible suspected foreign terrorists has a benefit of enhanced national security but also comes with a drawback of invasion of privacy.
Step-by-step explanation:
The benefit of allowing the NSA to monitor communication between US citizens and suspected foreign terrorists would be enhanced national security, as it would help prevent terrorist attacks. However, the drawback would be the invasion of privacy, as it would involve the monitoring of private conversations and potentially violate civil liberties.
As for whether this should be allowed, it is a controversial topic with different perspectives. Some argue that the trade-off between enhanced national security and the infringement on privacy is necessary for the safety of the country, while others believe it violates individual rights and poses a risk to civil liberties.