U.S. lawmakers are cheering the overnight airstrikes mounted against terror groups in Syria on Monday, which included attacks against the Islamic State and the al-Qaeda offshoot called the Khorasan Group, while some are lamenting the Congress' choice to avoid a war authorization vote.

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Members of the Congress particularly praised the administration's successful enlistment of Arab allies in the U.S.-led offensive against the jihadists.

At the same time, lawmakers who have denounced what many see as another costly and protracted military campaign in the Middle East have mostly been muted in the immediate aftermath of the Syrian airstrikes.

House Speaker John A. Boehner (R-Ohio) confirmed his support for President Barack Obama's decision to strike down Islamic State targets in Syria, LA Times reported.

Boehner said this is only the opening salvo for the larger campaign that Obama promised will eventually degrade and destroy the terror group.

House minority leader Rep. Nancy Pelosi (D-San Francisco) hailed the president for his strong leadership as he led the international coalition to take on the growing threat of the Islamic State group in Mideast.

Others, like Senate Armed Services Chairman Carl Levin (D-Michigan) praised the historic involvement of Arab forces in the air raids. Levin said the public involvement of Muslim nations is key to the long-term success of the international campaign against the Islamic State.

Ultimately, it is up to the Muslim nations to dissolve the harsh Islamist ideologies that have been fuelling terror attacks in the region and the West, said Levin.

Shortly after U.S. and its Arab allies begun hitting some 20 Islamic State targets in Raqqa, some lawmakers have appealed for an authorization vote.

Rep. Justin Amash (R-Michigan) took to Twitter on Monday night to condemn the air campaign as "irresponsible and immoral," citing the Congress' decision to take a recess in the wake of the Islamic State crisis.

Democratic Senator Tim Kaine is the most outspoken by far. Speaking at an event in Washington on Tuesday, he criticized President Obama for authorizing the air raids without Congress authorization.

Likewise, Kaine said, the Congress is culpable for allowing the campaign to happen without its approval, CNN reported.

The House and the Senate have voted only on a narrow authorization to train moderate Syrian rebels with the help of Arab allies before leaving for recess.

The House will sit in session on November 12 when they are expected to debate and approve a spending bill to finance the war in Mideast.

TagsISIS, ISIL, Daesh, Syrian airstrikes