Updated at 6:50 p.m.

White House press secretary Jay Carney said Monday that Dzhokhar Tsarnaev will not be classified as an “enemy combatant,” despite pressure from some congressional Republicans to do so. Speaking during his daily press briefing, his first since the Boston bombing, Carney said Tsarnaev will be tried in civilian court.

“We will prosecute this terrorist through our civilian system of justice," Carney said. "Under U.S. law, United States citizens cannot be tried in military commissions.”

Later, federal authorities said Tsarnaev would be charged with using a weapon of mass destruction.