HOUSE SPEAKER Nancy Pelosi (D-Calif.) offered an excellent demonstration yesterday of why members of Congress should not attempt to supplant the secretary of state when traveling abroad. After a meeting with Syrian dictator Bashar al-Assad in Damascus, Ms. Pelosi announced that she had delivered a message from Israeli Prime Minister Ehud Olmert that "Israel was ready to engage in peace talks" with Syria. What's more, she added, Mr. Assad was ready to "resume the peace process" as well. Having announced this seeming diplomatic breakthrough, Ms. Pelosi suggested that her Kissingerian shuttle diplomacy was just getting started. "We expressed our interest in using our good offices in promoting peace between Israel and Syria," she said.

Only one problem: The Israeli prime minister entrusted Ms. Pelosi with no such message. [...]

As any diplomat with knowledge of the region could have told Ms. Pelosi, Mr. Assad is a corrupt thug whose overriding priority at the moment is not peace with Israel but heading off U.N. charges that he orchestrated the murder of former Lebanese prime minister Rafiq al-Hariri. The really striking development here is the attempt by a Democratic congressional leader to substitute her own foreign policy for that of a sitting Republican president. Two weeks ago Ms. Pelosi rammed legislation through the House of Representatives that would strip Mr. Bush of his authority as commander in chief to manage troop movements in Iraq. Now she is attempting to introduce a new Middle East policy that directly conflicts with that of the president. We have found much to criticize in Mr. Bush's military strategy and regional diplomacy. But Ms. Pelosi's attempt to establish a shadow presidency is not only counterproductive, it is foolish.