The committee also shortened the president's term from seven years to four years, freed the president to seek re-election after an initial term, and moved impeachment trials from the courts to the Senate. They also created the office of the vice president, whose only roles were to succeed a president unable to complete a term of office, to preside over the Senate, and to cast tie-breaking votes in the Senate. The committee transferred important powers from the Senate to the president, for example the power to make treaties and appoint ambassadors. One controversial issue throughout much of the convention had been the length of the president's term, and whether the president was to be term limited. The problem had resulted from the understanding that the president would be chosen by Congress; the decision to have the president be chosen instead by an electoral college reduced the chance of the president becoming beholden to Congress, so a shorter term with eligibility for re-election became a viable option.