CNN

WASHINGTON (CNN) - The Obama administration is committed to providing enough additional troops in Afghanistan, one of President Obama’s senior military advisers says.

In an interview that aired Sunday on CNN’s State of the Union, Admiral Mike Mullen, the Chairman of the Joint Chiefs of Staff, said that he, Obama, and retired Gen. Jim Jones, Obama’s National Security Adviser are all in agreement.

“Gen. Jones, and I, and the president, are all on the same page in terms of what we have to do now,” Mullen told CNN Chief National Correspondent John King. “President Obama has committed these troops. They’re arriving as we speak and will through the rest of this year.”

Mullen added that Gen. Stanley McChrystal, the new U.S. military commander in Afghanistan, is conducting a 60-day assessment to determine whether he has sufficient boots on the ground or whether he needs more troops on top of the additional 21,000 the Obama administration recently authorized.

Mullen also expressed optimism about the situation in Iraq where U.S. troops recently pulled back from Iraq’s major cities under an agreement signed by former President George W. Bush.

“I’m really encouraged based on what I see,” Mullen said.

Mullen added that he thought the military was on track to complete a withdrawal of all U.S. troops from Iraq by the end of 2011, also under the terms of an agreement with Iraq’s government.

Updated: 3:21 p.m.