We have proven what we are capable of doing with the core al-Qaida in west Pakistan, Afghanistan, he continued.
Republicans have continued to criticise the deal which has seen one US captive swapped for five high-level terrorists, increasing the bounty on the head of US hostage targets.
Senator John McCain agreed that the US had to attempt to bring back American captives but that he wouldn t have released these guys because of their history as some of the most dangerous terrorists in the world.
Allegations of desertion have been levelled against Bergdahl by former unit comrades who claim that the sergeant left his post voluntarily while on guard duty.
In light of the furore around Bergdahl s return, a hometown celebration to mark his release was cancelled while the FBI has revealed that his family has received threats.
He remains in a military hospital in Germany where he has told US officials that he was tortured, beaten and held in solitary confinement during his kidnap.