During a press conference last week, President Obama challenged Sens. John McCain (R-Ariz.) and Lindsey Graham (R-S.C.) to "come after me." Liberal filmmaker Michael Moore wants to see "more of that."

Moore writes in an open letter to Obama in the Huffington Post today:

At your first post-election press conference last Wednesday you were on fire. The way you went all Taxi Driver on McCain and company ("You talkin' to me?") was so brilliant and breathtaking I had to play it back a dozen times just to maintain the contact high. Jesus, that look -- for a second I thought laser beams would be shooting out of your eyes! MORE OF THAT!! PLEASE!!

Obama's remarks came in response to an earlier presser held by McCain and Graham in which they criticized U.N. Ambassador Susan Rice's initial public response to the Libya incident.