US stocks were mixed on Monday during midday trading as President Joe Biden and House Republican Speaker Kevin McCarthy prepared to meet to resume debt-ceiling negotiations later in the day, amid warnings a disastrous default is less than two weeks away. The S&P 500 (^GSPC) edged higher 0.17%, while the Dow Jones Industrial Average (^DJI) fell 0.15%.The technology-heavy Nasdaq Composite (^IXIC) rose 0.46% at 12:03 pm ET. Wall Street is bracing for crunch time in the debt-ceiling showdown, as the risk of a government default of some sort becomes more real. Anxiety is mounting, and Wall Street banks and asset...