Sen. Joe BidenJoseph (Joe) Robinette BidenGiuliani doubles down on Biden comments: 'I meant that he’s dumb' Meghan McCain shreds Giuliani for calling Biden a 'mentally deficient idiot' Dems say Obama return from sidelines is overdue MORE (D-Del.) took aim at John McCainJohn Sidney McCainThe Memo: Trump’s media game puts press on back foot Meghan McCain shreds Giuliani for calling Biden a 'mentally deficient idiot' Mueller warns of Russian midterm attack, while Trump attacks Mueller MORE over Iraq Monday, saying the Arizona senator and longtime military officer's Iraq policy fails to understand the reality of the situation.

Biden said McCain has a "total lack of understanding" and "no notion of what is going on" in Iraq.

"I don't understand anything about John's policy here," Biden said during a conference call with reporters. "I don't know what he is talking about except more of the same."

Biden said McCain's Iraq policy would "prevent" the US military from fighting resurgent al Qaeda and Taliban forces in Afghanistan and shows no "larger strategy" to fight terrorism beyond Iraq's border.

In an op-ed in Monday's New York Times, Obama called for a 16 month phased redeployment out of Iraq to free up troops to fight resurgent Taliban and al Qaeda forces in Afghanistan.

Biden called Obama's plan "profoundly right" and said it is "more in line with what our military needs are and what our military thinks."