President Obama's plan to send less than 50 special operations forces to Syria is not enough to combat the growing threat of the Islamic State, Sen. Dianne Feinstein (D-CA) told Chuck Todd on "Meet the Press" Sunday. The Democrat is joined by colleagues on both sides of the aisle who say that the Obama administration needs to understand the enemy it's dealing with in the Middle East and enforce a more aggressive foreign policy in the region.

Officials are all but convinced that the downing of a Russian jet last week was an ISIS-inspired plot. Feinstein said there is a "strong probability" that an airport employee was in on the hijack and planted a bomb onboard the doomed plane.

"It's the nature of ISIL," she said. "They do attack after attack."

In August, Feinstein said the president's strategy in Syria was too "cautious," considering the terror group has had an alarming presence in the region. She stands by those words today in light of Obama's tepid plan to "assist and advise" local forces.

"We need to totally be on our guard. We need to do those things that are prudent and direct. Special forces are limited, I think 50, that won’t do it. If we are really going to use special forces, quick in, quick out, you have to do it in a much more comprehensive way. Bombing alone isn’t going to do it. That hasn’t changed the dynamic.”

Feinstein isn't the only Democrat demanding the administration do more to confront ISIS. Rep. Adam Schiff (D-CA), a member of the House Intelligence Committee, suggested Obama's strategy is simply too weak.

“I agree that the president's approach basically has a battlefield that is pretty static and that more is going to have to be done,” he said.

The tragedy of Metrojet Flight 9268, Feinstein insists, should prompt world leaders to step up its anti-terror operations.

"I hope it's a wake up call to Putin and I hope to some extent it's a wake up call to us."