President Barack Obama met Japan's new Prime Minister Friday as he begins a four-nation trip to Asia, his first as president.

"I begin the trip in Tokyo because the alliance between the United States and Japan is a foundation for security and prosperity not just for our two countries, but for the Asia Pacific region."

A number of items are on the agenda, including efforts to spur economy growth.

Mr. Obama will also visit China, South Korea and Singapore.

But the big question lingers back home: whether the president will grant a requestto send thousands of more US troops to Afghanistan?

"The decision will be made soon. It will be one that is fully transparent so that the American people understand exactly what we are doing and why we're doing it. "

Earlier this week, senator John McCain urged the president to provide an answer.

"I think it's very important that the president of the United States make a desicion as to what resources are necessary."

Former NATO Supreme Allied Commander George Joulwan says a key challenge for the US is making sure the Afghan government will be a reliable partner.

"So if it takes more time to make sure that we get the clarity that we need on the political side, I would weigh in on that. And say, let's get it right."

After a day of meetings, the president is expected to deliver a speech tonight 8 PM eastern time. In Washington, I'm Samantha Heyes.