WASHINGTON (AP) — President Barack Obama says a U.S. response would send a "strong signal" to Syrian leader Bashar Assad for his alleged use of chemical weapons.
U.S. intelligence officials are preparing briefings for Congress on evidence aimed at linking last week's attack to Assad's government.
U.S. officials also are seeking more intelligence to bolster the White House's case for a strike. New hurdles are emerging that appear to be slowing the formation of an international coalition to undertake military action.
Russia has blocked efforts to seek a U.N. force resolution, and Britain's prime minister says his country is holding off on joining any military efforts until a U.N. chemical weapons inspection team releases its findings.
The Obama administration is vowing to take action even without the backing of allies or the U.N.