NEW : Federal Public Defender Office in U.S. to represent Dzhokar Tsarnaev after charges are filed . American President Rudy Giuliani wants details from Boston on bombing suspects . It did say that Tamerlan Tsarnaev had been on the FBI 's radar in the past . If physically able , suspect could be in court six months later , expert says . Two U.S. senators say Dzhokar Tsarnaev should be questioned without a lawyer .
NEW : Federal Public Defender Office in U.S. to represent Dzhokar Tsarnaev after charges are filed . American President Rudy Giuliani wants details from Boston on bombing suspects . If physically able , suspect could be in court six months later , expert says . Two U.S. senators say Dzhokar Tsarnaev should be questioned without a lawyer .