WASHINGTON (AP) — The nation's top military leader told Congress on Tuesday that if President Barack Obama's expanded military campaign to destroy Islamic extremists fails, he would recommend that the United States consider deploying American ground forces to Iraq.

Army Gen. Martin Dempsey, the chairman of the Joint Chiefs of Staff, told a Senate panel that the goal for American advisers is to help Iraqi forces with planning, logistics and coordinating military efforts by coalition partners to take out members of the Islamic State group.

"To be clear, if we reach the point where I believe our advisers should accompany Iraqi troops on attacks against specific ISIL targets, I will recommend that to the president," Dempsey told the Senate Armed Services Committees, using an alternative name for the group.

Pressed during questioning, Dempsey said he "would go back to the president and make a recommendation that may include the use of ground forces."

Obama has maintained that American forces will not have a combat mission in Iraq.

Dempsey and Defense Secretary Chuck Hagel faced multiple questions from lawmakers in the first high-stakes hearing examining Obama's expanded military campaign to counter the relentless terrorist threat from Middle East extremists.

Dempsey said Americans in Iraq are serving in a combat advisory role but not participating in direct combat. However, if the Iraqi forces took on a complex mission to retake Mosul, the general said he might want U.S. troops to accompany the Iraqi troops or provide close combat advice.

The apparent contradiction of combat-trained forces not participating directly in combat was captured in one exchange between Sen. Jim Inhofe, R-Okla., and Dempsey.

"Are pilots dropping bombs in Iraq a direct combat mission and will U.S. forces be prepared to provide search and rescue mission if pilots get shot down and be prepared to put boots on the ground to make that mission be successful?" Inhofe asked.

"Yes and yes," Dempsey said.

The U.S. military conducted strikes near Baghdad against the Islamic State group, which has seized large swaths of Iraq and Syria. Obama is seeking congressional support to train and equip vetted Syrian moderates fighting both the Islamic militants and forces loyal to President Bashar Assad.

Dempsey said the United States is prepared to strike Islamic targets in Syria.

"This will not look like 'shock and awe' because that is not how ISIL is organized. But it will be persistent and sustainable," Dempsey said, referring to the air bombardment at the start of the Iraq war in March 2003.

Several lawmakers have their doubts about the United States being pulled into a larger war, with increasing numbers of American troops. The president has already dispatched more than 1,000 Americans three years after combat forces left Iraq.

Many Republicans and Democrats have expressed reservations about the ability to identify moderates in a country awash with rebel formations and shifting alliances. The Islamic State grew out of the al-Qaida movement, but the two are now fighting. In some instances, the moderate Free Syrian Army has teamed with al-Qaida's local franchise, the Nusra Front.

Hagel said the U.S. will monitor them closely to ensure that weapons don't fall into the wrong hands.

"There will always be risk in a program like this, but we believe that risk is justified by the imperative of destroying ISIL — and the necessity of having capable partners on the ground in Syria," the defense secretary said.

Anti-war protesters filled the front rows at the hearing, chanting "no more war" at the start of the session and repeatedly interrupting the testimony. The protesters were escorted from the room.

Hagel said the involvement will not be "an easy or brief effort. We are at war with ISIL, as we are with al-Qaida."

Obama and Vice President Joe Biden met in the Oval Office with retired Marine Gen. John Allen, who is coordinating international efforts to combat the Islamic State militants. Brett McGurk, a top Iraq adviser at the State Department, also took part in the meeting.

Racing to finish its work and leave Washington for midterm campaigning, House Republicans finalized legislation to authorize the mission to arm and train moderate Syrian rebels.

The authorization under consideration will be included as an amendment to a spending bill Congress must pass to keep the government open until mid-December. That would give lawmakers the opportunity to hold a separate debate and vote on the matter — something members of both parties want. Votes could come as early as Wednesday.

Bowing to congressional fears that any vote is tantamount to a war vote, the legislation includes a provision stating that "nothing in this section shall be construed to constitute a specific statutory authorization for the introduction of U.S. armed forces into hostilities or into situations wherein hostilities are clearly indicated by the circumstances."

The provision reflects a congressional divide between hawks seeking tougher action than that proposed by Obama and lawmakers weary from more than a decade of U.S. wars in Iraq and Afghanistan.

The measure compels the Pentagon to present Congress with a plan 15 days before any training begins and requires ongoing updates every 90 days.

The U.S. plan is to develop moderate Syrian forces at Saudi Arabian training sites before helping them return to the battlefield. It's unclear how long they would need to be trained to be battle-ready or how the U.S. could ensure their attention remained on fighting extremists and not just the Syrian government.

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AP White House Correspondent Julie Pace contributed to this report.