evidence: As he makes his first visit to the border as President on Sunday, Joe Biden is witnessing a human rights crisis unfolding both in his own backyard and Mexico’s. [...] Biden’s visit comes at a politically charged moment for the country’s immigration policies, as well as his own political future. He has not yet announced whether he will run for re-election, but is widely expected to do so. Republicans have frequently criticized how Biden has not visited the border during his presidency, using the fact as a way of arguing that he has no interest in taking the border situation seriously. "The border is President Biden’s greatest vulnerability right after inflation," says Republican political consultant Whit Ayres, adding, "If you watch Fox News, it seems like half the stories they run are about chaos at the border."