The Democratic-controlled House of Representatives impeached Trump in December on two charges in the Ukraine matter, setting the stage for the trial in the Republican-led Senate on whether to remove him from office.
The president's defence wrapped up its arguments early on Tuesday, having used around half of its allotted 24 hours over three days.
The impeachment charges say the president froze vital military aid to Ukraine for two months last summer to pressure President Volodymyr Zelenskiy to publicly announce the probes, illicitly drawing a foreign nation into U.S. electoral politics.
Bolton, who left the Trump White House in September 2019 after clashing with the president on foreign policy, refused to provide a deposition to the House during the impeachment inquiry in November, but said that he would testify in the Senate trial if pressed to do so. Senator Ted Cruz exuded confidence that Trump will be acquitted of all the charges at the end of the trial.
If they don't vote to extend the trial by having witnesses, there could be votes on some other motions, which we don't know the content of yet, before senators move to final deliberations on the impeachment articles. Such a deal, so far, has had few takers as most Republicans don't want to hear from Bolton and few Democrats want to draw the Bidens into the impeachment proceedings.
Senators have had to sit in silence, without electronics, listening as the House managers made their case for Mr. Trump's removal and the President's lawyers argued for his acquittal.
"Many more mistakes of judgment, gets fired because frankly, if I listened to him, we would be in World War Six by now, and goes out and IMMEDIATELY writes a nasty & untrue book".
Jay Sekulow, the president's personal lawyer, said: "The bar for impeachment can not be set this low".
A letter from the White House National Security Council to Bolton's lawyer said the manuscript based on a preliminary review appeared to contain "significant amounts of classified information" and could not be published without the deletion of this material.
Bolton’s publisher says there was ‘no coordination’ with New York Times
Trump's team has maintained that the holdup in aid was separate from his requests for an investigation into the Bidens. Democrats quickly highlighted the Times report to bolster their calls for Bolton to testify.
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All 100 USA senators will get a chance over the next two days to ask questions in President Donald Trump's impeachment trial after hearing opening arguments from both the prosecution and the defense teams.
"I've said from the beginning that I felt that it was likely that we would need to call a couple of witnesses... in order to clarify some ambiguities, answer some questions".
He is the third president in United States history to be impeached and go on trial in the Senate.
Bolton's manuscript directly contradicts Trump's account of events. But Republicans may direct many of their questions to the counsel to help bolster the President's case while Democrats may direct many of their questions to the House managers to help bolster theirs.
"You can not impeach a president on an unsourced allegation", Trump's personal lawyer Jay Sekulow told the Senate.
The implication of the poll for Trump's opponents is clear: Americans want witnesses, so let Bolton in.
They tackled the allegations on Wednesday - that Mr Trump told Mr Bolton he wanted to keep freezing military aid for Ukraine until he got help with investigations of his political rivals - head on. "It's not appropriate for a president to engage a foreign government in an investigation of a political opponent", The Columbus Dispatch reported Portman said in October.
"I think Bolton probably has something to offer us", said Republican Alaska Sen.
© Drew Angerer/Getty Images Defense team member and U.S. President Donald Trump's personal lawyer Jay Sekulow speaks to reporters during a recess in the impeachment trial at the U.S. Capitol on January 22, 2020 in Washington, DC. "Why do they want Bolton and not me?"