Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (D-Calif.) on Tuesday said the U.S. must take “direct” military action against an Islamic extremist group marching on Baghdad and called for Iraq’s president to step down.

"I think most important is that we take direct action now against ISIS [the Islamic State of Iraq and Syria], marching down to Baghdad, and prevent them from getting into Baghdad," the Senate Intelligence chairwoman said.

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Feinstein said she was “in communication” with the White House and Director of National Intelligence James Clapper. Asked if drone or air strikes could be an element of any action, she responded they “could be, absolutely.”

ISIS, a Sunni al-Qaeda-linked group, has captured key cities in Iraq, including Mosul, Tikrit and Tal Afar, and are near Baghdad, raising worries that the government of President Nouri al-Maliki could lose the capital.

The lightning advance has caused alarm for the White House over the prospect of losing a country U.S. troops fought in for almost a decade and sparked fears of a sectarian civil war between Sunnis and the majority Shia government.

Feinstein said Maliki should go, saying he had failed to create a broad representative government that included the minority Sunni population.

"I think it's most important that the Maliki government be replaced, and that includes Mr. Maliki, with a reconciliation government," she said. "Based on all I've heard, read and know, Mr. Maliki is not able to bring about reconciliation in that country.

"So you need the political strategy, you need the military strategy -- hopefully that's going to be forthcoming," said Feinstein.