Democratic Sen. Adam Schiff (Calif.) said Sunday that both parties are to blame for Congress not asserting its authority to declare war over the last two decades. “Both parties have fallen down on the job in terms of asserting Congress’s war power,” Schiff told host Kristen Welker on NBC’s “Meet the Press.” The California Democrat specifically cited former President Obama approving military action in Libya in 2011. While in the House at the time, Schiff urged Obama to seek congressional authorization for such a move, but the president proceeded with intervention — alongside NATO allies — without it.  “I think that was a mistake then,” Schiff recalled. “I think it’s an even bigger mistake now.” During his two terms, Obama also authorized military strikes without congressional approval in Pakistan, Yemen and Somalia. His administration often said the strikes were targeting terrorists in those countries; Congress authorized the War on Terror in response to the Sept.…