Lawmakers pressed the U.S. Congress on Sunday to authorize President Barack Obama's war against the Islamic State, also known as Daesh, in Iraq and Syria.

During an interview with ABC's "This Week," U.S. Speaker of the House John Boehner said the president had "legal authority" to launch strikes against the Islamic State militants, but he called on lawmakers to create a resolution that would support Obama's strategy.

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"I think the president is authorized to do it, but Congress has to consider backing the proposal," Boehner said.

Boehner also said there is a threat that the United States could get involved in a ground war in the Middle East.

The president and other U.S. officials said votes to authorize the deployment of additional forces were no longer needed.

However, political analysts said that America's involvement in the war could stifle anti-war Democrats from participating in the midterm elections.

In an interview with CNN, Connecticut Democratic Senator Chris Murphy of the Senate Foreign Relations Committee, said the Congress need to settle the issue of the U.S. military involvement in the Syrian war.

According to Murphy, the United States needed a clear political strategy about engaging in the Middle Eastern war, something that was currently still lacking.

Additionally, Wyoming Republican Senator John Barrasso, of the Foreign Relations Committee, said Obama should call back the House to start discussing the issue, like what British Prime Minister David Cameron did with the British parliament.

Furthermore, Virginia Democratic Senator Tim Kaine, said though he supports the administration's foreign policy strategy, he believed that current war resolutions do not give Obama the authority to decide unilaterally.

Kaine said the nation should not wage a war without Congress.

Meanwhile, Deputy National Security Adviser Tony Blinken told "Fox News Sunday" that the United States' move to fight the Islamic State will take a "long term effort."

Blinken added that though U.S. forces are showing progress in their attacks, it would take some time before the ground forces would be at its full strength.

Tagspolitics, War Conflict, John Boehner, United States House of Representatives