President Biden and his predecessor, Donald Trump, made separate trips to the Texas-Mexico border on Thursday to advocate their own versions of who’s to blame for the problems there. While each placed responsibility on the other, Biden added a political dare for his potential election opponent, the New York Times reports—challenging him to support the border legislation the former president had instructed congressional Republicans to block. Here’s a look at their arguments: Biden: “Join me, or I’ll join you in telling the Congress to pass this bipartisan border security bill,” the president sa…