CNN | John Roberts, as Senate trial nears end, finally says he won't break ties

"If the members of this body elected by the people and accountable to them divide equally on a motion, the normal rule is that the motion fails. I think it would be inappropriate for me, an unelected official from a different branch of government, to assert the power to change that result so that the motion would succeed."

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"It is a sad day for America to see Senator McConnell humiliate the Chief Justice of the United States into presiding over a vote which rejected our nation's judicial NORMS, precedents and institutions which uphold the Constitution and the rule of law," Pelosi said Saturday on Twitter.

Contrary to claims by Trump and some Republican allies, House Democrats did seek testimony from Bolton, but he declined to appear for his deposition under White House orders.

Former Trump adviser Bolton threatened to sue if subpoenaed to testify in impeachment probe: committee (7 Nov 2019)

The House did not issue a subpoena because, Democrats said, it would only prolong the process.

Schumer, Amd. 1296

Mr. SCHUMER proposed an amendment to the resolution  S.Res. 488
[...]
Notwithstanding any other provision of this resolution, pursuant to rules V and VI of the Rules of Procedure and Practice in the Senate When Sitting on Impeachment Trials, the Chief Justice of the United States, through the  Secretary of the Senate, shall issue a subpoena for the taking of testimony of John Robert Bolton, and the Sergeant at Arms is authorized to utilize the services of the Deputy Sergeant at Arms or any other employee of the Senate in serving the subpoena authorized to be issued by this section.

Mr. SCHUMER proposed an amendment to the resolution  S.Res. 488
[...]
Notwithstanding any other provision of this resolution, pursuant to rules V and VI of the Rules of Procedure and Practice in the Senate When Sitting on Impeachment Trials, the Chief Justice of the United States, through the Secretary of the Senate, shall issue a subpoena for the taking of testimony on oral deposition and subsequent testimony before the Senate of John Robert Bolton, and the Sergeant at Arms is authorized to utilize the services of the Deputy Sergeant at Arms or any other employee of the Senate in serving the subpoena authorized to be issued by this paragraph.

Mr. VAN HOLLEN proposed an amendment to the resolution S.Res. 488, to provide for related procedures
[...]
Notwithstanding any other provision of this  resolution, the Presiding Officer shall issue a subpoena for any witness or any document that a  Senator or a party moves to subpoena if the Presiding Officer determines that the witness or document is likely to have probative evidence relevant to either article of impeachment before the Senate, and, consistent with the authority of the Presiding Officer to rule on all questions of evidence, shall rule on any assertion of privilege.

"By the way, did anyone see what your senator, Joni Ernst, did yesterday? She spilled the beans," [Biden] said at a campaign stop in Muscatine on Tuesday [28 Jan] morning. "She just came out and flat said it. You know, the whole impeachment trial for Trump is just a political hit job to try to smear me, because he is scared to death to run against me and he has good reason to be concerned." Then he read out loud the comments Ernst made to reporters in Washington, D.C. Monday [27 Jan].

If the president asks for an investigation of possible corruption by a political rival under circumstances that objectively are in the national interest, should the president be impeached if a majority of the House believes the president is in it for the wrong reason?

If Ukrainian President Zelensky called President Trump and offered dirt on President Trump's political rivals in exchange for President Trump handing over hundreds of millions in military aid, that would clearly be bribery and an impeachable offense. So why would it be more acceptable--and somehow not impeachable--for the reverse, that is, for President Trump to propose the same corrupt bargain?