politicsnation, tonight s ali, start your engines. the biden reelection effort is shifting in the high gear, with the first official democratic contest of the primary season, just six days away. that will be in south carolina. president biden has been reengaging with folks this weekend, especially black voters, who were crucial to his 2020 victory. biden s also getting a jump start from the united auto workers who are standing with the president joining the picket lines with them during their striking in the fall. i ll talk to the uaw president tonight about the big endorsement and what it will meet to the biden campaign. back on capitol hill, maga republicans are slamming the brakes on a bipartisan immigration bill at the behest of their presidential front runner, donald trump. and the impact of this gridlock may be felt far beyond the border, jeopardizing military aid for ukraine and israel. all of that tonight. plus, the white house response to breaking news ou