Opinion: Don't give Obama blank check on war

Princeton, New Jersey — Despite all the questions surrounding the war in Afghanistan, congressional Democrats have not challenged the administration's policies since President Obama announced a surge of troops in 2009.

The release of classified documents about the war by the website WikiLeaks seemed to have no impact on Capitol Hill. The same week that the documents were released, the House approved legislation with almost no debate that will provide tens of billions of dollars for the war effort. ...

But Democrats who have doubts about the war can't afford to be silent. When Congress doesn't publicly ask tough questions of the White House, poor decisions have often ensued.

The decision over funding Afghanistan came one week before the the 46th anniversary of the passage of the Gulf of Tonkin Resolution on August 7, 1964.

Read more from Julian E. Zelizer, a professor of history and public affairs at Princeton University, who says a look back at the Gulf of Tonkin incident provides a cautionary tale for today's Afghan war, and that Congress must closely scrutinize a president's decisions on war strategy.