Sen. Doug Jones (D-Ala.) on Sunday floated subpoenaing 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's forthcoming memoir if the former official isn't called to testify himself.

"The Senate needs to hear from Bolton. The American people deserve to hear from Bolton. If we can’t get Bolton let’s get a subpoena for the book!" Jones tweeted.

The Senate needs to hear from Bolton. The American people deserve to hear from Bolton. If we can’t get Bolton let’s get a subpoena for the book!#subpoenathebook#ImpartialJustice https://t.co/vDCVMORMtI — Doug Jones (@DougJones) January 26, 2020

Jones hasn't said if he will vote to convict or acquit 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 at the end of the trial, but has thrown his support behind the call for more witnesses and documents.

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His suggestion comes after The New York Times, citing sources familiar with Bolton's writing, reported that Bolton claims in his book that Trump sought to tie up $391 million in aid to Ukraine to his requests for the country's leaders to help with investigations into Democrats, including former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and his son Hunter Biden.

The report comes as the Senate is expected to vote this week on whether or not to allow calling new witnesses or documents.

Democrats immediately seized on the Times report to double down on their demand that Bolton testify.

"Senators should insist that Mr. Bolton be called as a witness, and provide his notes and other relevant documents. The Senate trial must seek the full truth and Mr. Bolton has vital information to provide," the House managers said in a statement.

Democrats need four Republicans to vote with them to allow for additional witnesses.