The Iraq war is to blame for high gas prices as its cost has weakened the dollar and driven oil speculation, Sen. Claire McCaskillClaire Conner McCaskillLobbying world Dem candidate has Hawley served subpoena at CPAC Annual scorecard ranks GOP environmental efforts far below Dems in 2018 MORE (D-Mo.), a national co-chair of Barack ObamaBarack Hussein ObamaBudowsky: Biden or Beto: Where's the beef? Super Tuesday bonanza raises stakes for Dems Whatever happened to nuclear abolition? MORE's presidential campaign, said today.

"We cannot economically afford to keep borrowing two to three billion dollars a week from China," McCaskill said on MSNBC. "That's why gas prices are so high. People are speculating in commodities because nobody wants to go near our dollar. We cannot--it is unsustainable to continue to prop up, in the middle of a civil war, an Iraqi government that will not step up and do what they need to do."

McCaskill appeared on MSNBC this afternoon to discuss Obama's planned trip to Iraq and Afghanistan. McCaskill is a national co-chair of Obama's campaign. When host Monica Novotny pressed McCaskill on Obama's plan to withdraw from Iraq despite recent security gains, McCaskill pushed back by saying the war's cost is unsustainable.

"If you can't leave Iraq when it's stable and you can't leave Iraq when it's not stable, that means that we're stuck with George Bush and John McCainJohn Sidney McCainTrump blasts McCain, bemoans not getting 'thank you' for funeral Trump's approval rating stable at 45 percent GOP senator: Trump's criticism of McCain 'deplorable' MORE--we can never leave Iraq," McCaskill said. See the video below.