I agree with the Senator from Illinois [Mr. BROWNING], that the whole conduct and declaration of the author may be legitimately employed to elucidate the character of this letter; but I found no supplementary charge on such conduct or declaration. Others may use the argument that the Senator has declared himself against coercion of the Rebel States, or that he has refused to vote the necessary means for the suppression of the Rebellion; but I use no such argument. Much as I lament such a course, and justly obnoxious as I regard it, yet I cannot consider it as an argument for expulsion of the Senator. Freedom of debate is among the triumphs of modern civilization; and it shall never be impaired by any vote or word of mine. To this freedom I have held fast, when almost alone in this body; and what I have steadily vindicated for myself against all odds I shall never deny to another. Therefore, if I am the judge, there is no Senator who will not always be perfectly free to speak and vote as he thinks best on every question that shall legitimately arise; but beyond this immunity he must not go. He shall not talk treason; he shall not parley with rebellion; he shall not address to it words of sympathy and good-will; especially, he shall not recognize its chief in his pretended character of President, nor shall he send him improved fire-arms to be employed in the work of treason. Putting aside all these considerations, the case against the Senator from Indiana is clear. All apologies, all excuses, utterly fail. It is vain to say that the bearer of the letter was his lifelong friend, as it is vain to say, also, that the Senator did not dream that there would be war. The first apology is as feeble as the second is audacious. If the Senator did not dream that there would be war, then why send arms to the chief of the Rebellion? To Jefferson Davis as a private citizen, to Jefferson Davis as a patriot Senator, there was no occasion or motive for sending arms. It was only to Jefferson Davis as chief of the Rebellion that arms could be sent; and to him, in that character, they were sent. But even if the Rebellion were not at that time manifest in overt acts,--as it clearly was,--still the sending of arms was a positive provocation and contribution to its outbreak, especially when the arms were sent by a Senator. And now, at the risk of repetition, I say again, it is not necessary that the war should have been commenced on the part of the United States. It is enough, that, on the part of Jefferson Davis, at the date of the letter, there was actual levying of war, or, at least, a purpose to levy war; and in either of these two cases, the latter as well as the former, the guilt of the Senator offering arms is complete,--call it treason, or simply disloyalty, if you will.