It would be illegal for the White House to launch a military strike against Syria without congressional approval, Rep. Justin Amash (R-Mich.), one of the most outspoken GOP critics of President Obama and congressional leaders, said Tuesday.

The Michigan lawmaker used his Twitter account to respond to the news that House Speaker John A. Boehner (R-Ohio) has been consulted by the Obama administration about the potential use of force against Syria. Amash said that if Boehner believes the president will use force, the speaker should call the House back to Washington to debate and vote on that decision: