Anti-war filmmaker Michael Moore tore into President Obama for taking military action in Libya on Saturday. 

Moore, a frequent critic of President Bush for launching the Iraq War, unleashed a string on tweets comparing the U.S. military's mission in Libya to Iraq and Afghanistan, using a mantra coined by Charlie Sheen:

It's only cause we're defending the Libyan people from a tyrant! That's why we bombed the Saudis last wk! Hahaha. Pentagon=comedy

And we always follow the French's lead! Next thing you know, we'll have free health care & free college! Yay war!

We've had a "no-fly zone" over Afghanistan for over 9 yrs. How's that going? #WINNING !

Khadaffy must've planned 9/11! #excuses

Khadaffy must've had WMD! #excusesthatwork

Khadaffy must've threatened to kill somebody's daddy! #daddywantedjeb

Moore also suggested that Obama should return the Nobel Peace Prize he won in 2009:

May I suggest a 50-mile evacuation zone around Obama's Nobel Peace Prize? #returnspolicy

Moore's comments came after the U.S. launched 110 Tomahawk missiles at military targets in Libya as part of an allied effort to prevent forces loyal to Libyan leader Col. Moammar Gadhafi from overtaking the rebel-held city of Benghazi.

The strikes on Libya began on the eighth anniversary of the beginning of the Iraq War.

Obama explained Saturday the U.S. and its allies acted to protect the Libyan people from a potential massacre.

"Make no mistake, today we are part of a broad coalition," the president said. "We are answering the calls of a threatened people, and we are acting in the interest of the United States and the world."

The Michigan native and prominent left-wing activist supported Obama during the 2008 Democratic primary race. But since then, he has criticized the president for escalating the conflict in Afghanistan.

Moore penned an open letter to Obama in 2009 on the eve of his decision to send an additional 30,000 troops to Afghanistan, warning him not to do it.

"If you go to West Point tomorrow night and announce that you are increasing, rather than withdrawing, the troops in Afghanistan, you are the new war president," he wrote to Obama. "Pure and simple. And with that you will do the worst possible thing you could do — destroy the hopes and dreams so many millions have placed in you."