By David Lawder WASHINGTON (Reuters) -U.S. President Joe Biden will act “methodically” in deciding how to respond to Saudi Arabia over oil output cuts, but options include changes to U.S. security assistance, White House national security adviser Jake Sullivan said on Sunday. Sullivan, speaking on CNN, said no changes to the U.S.-Saudi relationship were imminent as Biden re-evaluates it. “And so the president isn’t going act precipitously. He is going to act methodically, strategically and he’s going to take his time to consult with members of both parties, and also to have an opportunity for …