Senators John McCain, R-Ariz., and Joe Lieberman, I-Conn., visited Kabul, Afghanistan on Thursday to show their support for the U.S. mission there.

The senators were part of a delegation that met with nation's top leaders to discuss America's war strategy.

McCain said the U.S. has the "right resources" and "strategy" to succeed in Afghanistan. But he expressed concerns over President Obama's drawdown policy, saying it's essential not to pull troops out too early.

Meanwhile, the senators met with leaders in Pakistan, Friday, to address the nation's concerns over the Afghan military surge as well as continued U.S. missile strikes against targets in the region.

"We have to take measures in order to prevent those attacks from happening," McCain said. "And many times that is to go to the source of where those attacks are being planned and orchestrated."