Vice President Joe Biden made a surprise visit to Afghanistan, Monday, to assess the progress being made in handing security over to Afghan forces.

This was Biden's second trip to the region.

The Afghan government is still not cooperating fully with the U.S. military strategy, causing tension between the Obama administration and Afghanistan President Hamid Karzai.

Biden is expected to meet with Karzai during his visit. President Barack Obama visited Afghanistan last month, but did not meet with the Afghan leader.

Biden will also visit with U.S. troops and tour an Afghan army training center.

A senior U.S. official traveling with Biden said the visit comes at a "pivot point in our policy," and would give Biden an opportunity to discuss progress toward the transition.