(Carolyn Kaster/AP Photo)

Although President Obama has not made a decision yet, several senior administration officials tell ABC News he is unlikely to order a large-scale air offensive against militant targets in Iraq.

If the president opts for air strikes of any kind, it would likely be very limited - similar to the kind of targeted drone strikes we have seen on specific targets in Yemen and Pakistan, the sources said.

The leading option right now is sending a small contingent of special operations forces to advise and train the Iraqi army, according two senior U.S. officials.

As for timing, the president is likely to make a decision before the end of the week, but probably not today. He meets with the congressional leaders at the White House this afternoon.