Zbigniew Brzezinski, who enthusiastically campaigned for U.S. President Barack Obama, has called on the president to shoot down Israeli planes if they attack Iran. “They have to fly over our airspace in Iraq. Are we just going to sit there and watch?” said the former national security advisor to former U.S. President Jimmy Carter in an interview with the Daily Beast. Brzezinski, who served in the Carter administration from 1977 to 1981, is currently a professor of American foreign policy at Johns Hopkins University's School of Advanced International Studies in Maryland.

“We have to be serious about denying them that right,” he said. “If they fly over, you go up and confront them. They have the choice of turning back or not. No one wishes for this but it could be a 'Liberty' in reverse.’" Israel mistakenly attacked the American Liberty ship during the Six-Day War in 1967.

Brzezinski was a top candidate to become an official advisor to President Obama, but he was downgraded after Republican and pro-Israel Democratic charges during the campaign that Brzezinski’s anti-Israel attitude would damage Obama at the polls.

President Obama’s advisors have emphasized that the former national security advisor is not playing any unofficial role as advisor to the White House.

His enthusiasm for President Obama has waned in the past several months. He recently told a London-based newspaper that the United States may be "sliding into a deeper conflict with various segments of the world of Islam ” because of the president’s failure to carry out his promises to the Muslim world.

Brzezinski said the Obama administration is "diddling around" in trying to reach an “evasive compromise” between Israel and the Arab world.