Amnesty International accuses Tunisian law enforcement of abusing new counterterrorism legislation and committing human rights violations.
Tunisia's Prime Minister, Habib Essid, has claimed that UK military action is partly to blame for the current "chaos" in neighboring Libya, blaming the instability on Western intervention there in 2011.
The barrier, which would cover about a third of the border with trenches and sand fortifications, is intended to “stop terrorists groups from infiltrating" following a spate of attacks.
Authorities have tightened security at tourist sites in an attempt to reassure visitors in the wake of the Tunisian beach resort attack.
Tunisian officials say the attacker, who shot dead six people before killing himself, was a soldier with "behavioral issues" who was forbidden from carrying a weapon.