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Iraq: Attacks and U.S. Strikes Reopen Discussion of U.S. Military Presence

Updated September 10, 2024

After a months-long pause (Figure 1), recurrent attacks on facilities in Iraq hosting U.S. personnel and U.S. defensive measures could affect U.S.-Iraqi talks on the future of U.S. forces in Iraq. Iran-backed armed groups attacked U.S. personnel in Iraq more than 60 times between the October 2023 onset of the Israel-Hamas war and February 4, 2024, and, in response, President Joe Biden ordered U.S. air strikes in Iraq and in neighboring Syria. Iraq’s government, citing risks to Iraq’s security from the attacks and U.S. counter-strikes, announced in January 2024 that it seeks to end the presence in Iraq of the U.S.-led Global Coalition to Defeat the Islamic State (IS, aka ISIS/ISIL) and to engage in bilateral discussions about the future of the U.S. military presence. Attacks recurred in April, July, and August 2024, including an attack that wounded U.S. personnel on August 5. A U.S. defensive strike on July 30 marked the first such U.S. strike since February 2024.

At July 2024 Joint Security Cooperation Dialogue talks, the two governments “decided to begin work on a memorandum of understanding (MOU) to provide an enhanced framework for their bilateral security relationship.” Press reports indicated the July 30 U.S. strike killed members of the state-affiliated 47^th Popular Mobilization Forces (PMF) brigade, which reportedly consists of members of the Iran-backed, U.S.-designated Foreign Terrorist Organization Kata’ib Hezbollah (KH). An Iraqi official called the U.S. strike “a heinous crime” and said it could embroil Iraq in regional conflict.

In September, a press report citing an unnamed senior U.S. official said the United States and Iraq have reached an unannounced agreement that would see some U.S. forces withdraw from Iraq in 2025, with a residual force remaining in the Kurdistan Region until 2026 to support operations in Syria, with a bilateral security cooperation mission continuing thereafter.

In June 2024, President Biden cited the Iraqi government’s invitation for U.S. forces and the coalition to remain in Iraq in his semiannual war powers report to Congress. As of December 2023, U.S. Central Command reported that approximately 2,400 U.S. military personnel were deployed in Iraq and 800 in Syria. The U.S. military presence in Iraq and U.S. military access to Iraq’s airspace and land border with Syria facilitate U.S. military operations in Syria. U.S. forces warn the IS attacks have increased during 2024 and report that Iran-backed groups’ attacks since October 2023 have required resource reallocation and greater force protection.

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Attacks, U.S. Strikes, and Iraqi Responses

Following the U.S. killing in Iraq of Iran’s Islamic Revolutionary Guards Corps (IRGC)-Qods Force commander Qasem Soleimani and an Iraqi security official (both U.S.-designated terrorists) in January 2020, Iraq’s parliament voted to direct the Iraqi government to expel foreign forces and deny foreign access to Iraqi airspace, territory, and waters. Iraq’s then-caretaker government did not do so, and its successors engaged U.S. counterparts in talks that led in December 2021 to an announced end to U.S. combat operations and a transition to training and advisory support. Intermittent attacks on U.S. forces in Syria and Iraq continued into 2023, with some attributed to Iran-backed Iraqi groups. President Biden directed strikes following some attacks on U.S. personnel in Syria and Iraq, and the Administration has stated its intent to defend U.S. personnel with “proportional” responses.

Figure 1. Attacks on U.S. Personnel and U.S. Strikes in Iraq and Syria

Since October 17, 2023, and as of September 10, 2024

Source: CRS, using U.S. Department of Defense announcements and media reports. On October 24, 2023, the Department of Defense acknowledged 13 attacks on U.S. forces since October 17, 2023. Notes: KH = Kata’ib Hezbollah. HN = Harakat Hezbollah al Nujaba. CRS cannot validate attack and strike details. Attack incidents involving multiple targets may be considered a single incident. Unreported/unacknowledged incidents not reflected. Data approximate and subject to revision.

From October 2023 to February 2024, observers documented more than 150 claimed attacks by the “Islamic Resistance in Iraq” on U.S. and other targets in Iraq, Syria, Israel, and Jordan, including the January 28 attack in Jordan that killed and injured U.S. servicemembers. Reportedly, U.S. response strikes destroyed facilities of the IRGC and of an Iran-backed Iraqi group in Syria and Iraq, and killed some members of Iraqi groups inside Iraq. Iraq’s government has described attacks on U.S. forces as hostile acts while saying U.S. strikes in Iraq violate Iraqi sovereignty. After a U.S. strike on February 7 killed a KH leader, relative calm prevailed, but subsequent attacks and the U.S. strike on July 30 suggest that previous patterns could resume.

Some members of Iraq’s parliament call for the expulsion of U.S. forces. Iraq’s parliament could play a role in ratifying any future bilateral security agreements.

Possible Considerations for Congress

In December 2023, Congress authorized U.S. counter-IS partnership programs in Iraq and Syria through December 2024. Members of Congress may consider how potential changes to the U.S. or coalition presence in Iraq may affect U.S. interests in the region; whether changes should be made to patterns of

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U.S. assistance to Iraqi and Syrian partners; whether additional consultation with the executive branch or oversight is warranted; and how attacks on U.S. personnel and U.S. strikes comport with the War Powers Resolution and the 2001 and 2002 legislative authorizations for the use of military force.

In considering possible outcomes of regional security developments and U.S.-Iraqi talks, executive branch requests for regular and supplemental funding, and defense authorization provisions in 2024, Congress may assess the following:

• How essential is the U.S. and coalition military presence in Iraq? How does the U.S. military presence in Iraq relate to U.S. efforts to counter and deter Iran? How does it affect risks of wider conflict?

• How might changes to the U.S. and/or coalition presence in Iraq affect

• U.S. operations in Syria? U.S. embassy security? The NATO mission in Iraq?

• Iraq’s security and regional security?

• relationships between Iraqi groups and the Iraqi government, including the Kurdistan Regional Government and U.S.-supported peshmerga forces?

• How if at all should U.S. defense and foreign assistance funding and authorities evolve?

Author Information

Christopher M. Blanchard Specialist in Middle Eastern Affairs

Disclaimer

This document was prepared by the Congressional Research Service (CRS). CRS serves as nonpartisan shared staff to congressional committees and Members of Congress. It operates solely at the behest of and under the direction of Congress. Information in a CRS Report should not be relied upon for purposes other than public understanding of information that has been provided by CRS to Members of Congress in connection with CRS’s institutional role. CRS Reports, as a work of the United States Government, are not subject to copyright protection in the United States. Any CRS Report may be reproduced and distributed in its entirety without permission from CRS. However, as a CRS Report may include copyrighted images or material from a third party, you may need to obtain the permission of the copyright holder if you wish to copy or otherwise use copyrighted material.