WASHINGTON _ Treasury Secretary Timothy Geithner said Tuesday the new administration will wage an aggressive two-front battle against the worst financial crisis in seven decades, while the Federal Reserve announced it was expanding a key lending program to up to $1 trillion. Meanwhile, General Motors Corp. said it will cut 10,000 salaried jobs, citing the need to restructure itself with a government deadline looming and amid some of the worst sales in the auto industry’s history.