Biden and Trump Try to Score Points in Dual Border Visits

President Biden and former President Donald J. Trump made dueling visits to the U.S.-Mexico border on Thursday, with Mr. Biden challenging his predecessor to “join me” in securing the country’s southern frontier and Mr. Trump blaming the president for lawlessness at the border.The remarks came at a moment of political peril for Mr. Biden, who has faced criticism from both parties as the number of people crossing into the United States has reached record levels, with migrant encounters more than double than in the Trump years.In appearances some 300 miles apart in Texas, Mr. Biden and…