Lincoln left no surviving statements in his own hand on the subject during the last two years of his presidency. An entry in the diary of presidential secretary John Hay, dated July 1, 1864, claims that Lincoln had "sloughed off" colonization, though attributes that change to the president's frustration with corrupt contractors rather than to any philosophical departure. In the fall of 1864, Lincoln wrote Attorney General Edward Bates to inquire whether the legislation of 1862 allowed him to continue pursuing colonization and to retain Mitchell's services irrespective of the loss of funding. General Benjamin F. Butler claimed that Lincoln approached him in 1865 a few days before his assassination, to talk about reviving colonization in Panama. Since the mid-twentieth century, historians have debated the validity of Butler's account, as Butler wrote it years after the fact and was prone to exaggerating his prowess as a general. Recently discovered documents prove that Butler and Lincoln did indeed meet on April 11, 1865, though whether and to what extent they talked about colonization is not recorded except in Butler's account.