Sen. John McCain (Ariz.), the Senate Armed Services Committee's top Republican, will meet today with senior administration officials on the topic of Afghanistan.

Yesterday, Chairman of the Joint Chiefs of Staff Adm. Mike Mullen told a group of senators that the Pentagon will likely need to send more troops to the war-torn country in order to defeat insurgents there.

The Obama administration is waiting for a report from the senior U.S. and NATO commander in Afghanistan, Gen. Stanley McChrystal, before deciding to send more troops.

McCain tweeted:

Headed to a briefing with Senior Administration officials on Afghanistan.

The Armed Services Committee is becoming divided on the issue of additional troops.

Sens. Joe Lieberman (I-Conn.), Lindsey Graham (R-S.C.), and McCain are senior committee members who favor sending more troops. Armed Services Committee chairman Sen. Carl Levin (D-Mich.) has indicated he would oppose an additional deployment.

Levin would like to send more trainers to help develop the Afghan armed services.