By Mica Rosenberg and Nandita Bose WASHINGTON (Reuters) -President Joe Biden's administration said on Thursday it will add sections to a border wall to stave off record migrant crossings from Mexico, carrying forward a signature policy of former President Donald Trump. Trump is the frontrunner for the Republican Party nomination to challenge Biden, a Democrat, in the 2024 presidential race. Trump made building border barriers a central tenet of his first campaign for president with the rally chant, "Build That Wall." One of Biden's first actions after taking office in January 2021 was to issue...
