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 McCaskillThe Hill's Morning Report — Can the economy help Republicans buck political history in 2018? Dems seek to leverage ObamaCare fight for midterms Dems say Obama return from sidelines is overdue MORE (D-Mo.), a national co-chair of Barack ObamaBarack Hussein ObamaShould President Trump, like President Obama, forsake human rights in pursuit of the deal with a tyrant? Obama shares summer reading list ‘Three Californias’ plan would give Dems more seats 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 McCainDonald Trump is delivering on his promises and voters are noticing The Memo: Trump’s media game puts press on back foot Meghan McCain shreds Giuliani for calling Biden a 'mentally deficient idiot' MORE--we can never leave Iraq," McCaskill said. See the video below.