President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's defense team does not expect to conclude its arguments in the Senate impeachment trial on Monday, an official familiar with the strategy said.

The official said the president's team of attorneys will use some time on Tuesday to wrap up its case. The defense is expected to use roughly eight hours on the Senate floor on Monday following a brisk two-hour presentation on Saturday.

The House managers used nearly all of the 24 hours allotted to them over the course of three days in making the case Trump should be removed from office after he was impeached for abuse of power and obstruction of Congress.

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Members of Trump's team have said they do not anticipate using the entirety of their 24 hours.

Once the defense team finishes its arguments, senators will have 16 hours to ask questions of both sides. Republican senators indicated Monday they expect a vote on whether to subpoena additional witnesses to take place on Friday.

The defense team opened its case on Saturday with two hours of arguments that sought to portray the House case against Trump as politically motivated and based largely on secondhand accounts.

But their case was complicated on Sunday night when The New York Times reported that former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE wrote in the manuscript of his upcoming memoir that Trump said in an August meeting that he did not want to release nearly $400 million in security aid for Ukraine until the country agreed to help with investigations into his political rivals.

The report undercuts a central defense of the White House — that Trump never explicitly made security aid contingent on investigations — and has only increased pressure on Republican senators to agree to hear new testimony from Bolton and other witnesses.

Trump has denied that he made the comments to Bolton, and the White House and some of the president’s allies have raised questions about the timing of the leak regarding Bolton’s book and his motivations.