President Obama’s abrupt about-face on Syria has a lot of American scratching their heads.

He’s talked about punishing the Syrian government for gassing civilians and has sounded for all the world as if he was ready to pull the trigger on a missile strike against Syrian military targets. Then he said: Not so fast; I want to ask Congress for authorization.

Now the debate has begun.

http://news.msn.com/us/lawmakers-begin-to-grapple-with-syria-question

U.S. Sen. John Cornyn, R-Texas, is beginning to sound reasonable. He says Syria should be punished, but the Senate will need to know precisely the scope of the attack and what the overall strategy will be. Sen. John McCain, R-Ariz., says an attack on Syria must be with “regime change” in mind, that it must lead toward a change of leadership in the Syrian government.

I believe the president is playing this issue smartly. Congress has asked for authority within the War Powers Act. Barack Obama now has given lawmakers the chance to exercise that authority.

Several ships of the U.S. Sixth Fleet are standing by in the eastern Mediterranean Sea. The hammer is pulled back and the missiles will fly when they get the order. The president has gathered compelling evidence that the Syrians used the gas on civilians. They must be punished, as Cornyn has said.

This debate should be full and complete. As the president said, he is both convinced that the Syrians did something that requires a response and that he also is leader of the world’s oldest constitutional democracy. The Constitution gives both houses of Congress co-equal authority to run the government, right along with the president.

It’s good that he’s asking for their authorization. I’m hopeful he can make the case, that we can act quickly and decisively — and then apply intense diplomatic pressure all sides in this bloody conflict to call a halt to the killing.