Regional bank stocks boost stock futures in early trading.

US stocks were mostly flat on Monday as investors await corporate earnings reports and economic news, including the inflation report and the looming debt ceiling debate. Regional bank stocks extended Friday's rally, with PacWest Bancorp soaring nearly 30%. Tyson Foods sank more than 12% after cutting its annual sales outlook range by $2 billion. Oil futures rose more than 2%. Treasury Secretary Janet Yellen warned that the US could default on its debt as early as June 1, and President Biden is expected to meet with congressional leaders to discuss solutions on Tuesday.