He was worried that he and other state-appointed generals would get obscure assignments, and running for Congress would allow him to resume his political career. Garfield opposed the initial talk of impeaching Johnson when Congress convened in December 1866, but supported legislation to limit Johnson's powers, such as the Tenure of Office Act, which restricted Johnson in removing presidential appointees. In September 1870, Garfield, then chairman of the House Banking Committee, led an investigation into the Black Friday Gold Panic scandal. The investigation was thorough, but found no indictable offenses. Garfield blamed the easy availability of fiat money greenbacks for financing the speculation that led to the scandal.