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Rep. Justin Amash, R-Cascade Township, tweeted Tuesday that House Speaker John Boehner should convene that chamber's members if he believes President Barack Obama will use military force in Syria.

(AP Photo/J. Scott Applewhite)

GRAND RAPIDS, MI — U.S. Rep. Justin Amash on Tuesday said any use of force against Syria after allegations of chemical weapons use is "unquestionably unconstitutional."

Amash, R-Cascade Township, tweeted his stance after reports House Speak John Boehner had met with Obama administration officials about a possible military strike.

The outspoken sophomore lawmaker implored Boehner to call House members back from their August recess if the speaker thinks President Barack Obama will use force.

"If @SpeakerBoehner believes Pres Obama intends to use force in #Syria, then I urge him to call House back into session to debate & vote," Amash tweeted.

In another tweet shortly after, Amash linked to a Cornell University document laying out the legal implications of a president's power to authorize a strike:

"Unquestionably unconstitutional & illegal for Pres to strike #Syria w/o congressional auth. War Powers Res is clear: http://www.law.cornell.edu/uscode/text/50/1541 …."

Amash has been staunchly opposed to the use of military force in Syria. Last month, he signed on to efforts to limit actions the federal Defense Department could take there.

His name was on amendments to a defense spending bill that would curb funds used for military intervention in Syria. The full Senate has yet to consider the bill.

Amash also has cosponsored the War Powers Protection Act of 2013, which would require congressional approval for any funds used to intervene in Syria.

White House spokesman Jay Carney told reporters Tuesday that Obama and advisers are mulling what action to take against Syria.

Reports surfaced recently that thousands, including scores of children, were killed by chemical weapons in that country. Its leaders have said rebel forces used them.

Not all share Amash's sentiment that Obama would be out of legal bounds by ordering a strike against Syria.

A TIME magazine writer argued this week that Obama created a blueprint for this when the U.S. bombarded Libya with missiles in 2011:

In any case, a recent Reuters poll found only 9 percent of Americans support intervention by Obama.

Zane McMillin is a government, weather and breaking news reporter for MLive.com and The Grand Rapids Press. Email him, and follow him on Twitter.