Sen. Doug Jones (D-Ala.) is questioning in a new op-ed whether a majority of senators will "pursue the truth" in the upcoming impeachment trial of President Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE.

Jones, considered the most vulnerable Senate Democrat up for reelection next year, called for a “full, fair and complete trial” with all necessary witnesses and documents to fulfill the Senate’s “solemn constitutional duty.”

“I fear, however, that we are headed toward a trial that is not intended to find the whole truth,” he wrote Monday in The Washington Post. “For the sake of the country, this must change.”

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Jones said the current amount of evidence may be enough to “make a judgment” but called it “clearly incomplete.”

The senator requested at least four witnesses with “direct knowledge” of the White House's withholding of military aid to Ukraine to testify: former national security adviser John Bolton John BoltonDOJ launches probe into Bolton book for possible classified information disclosures Gary Cohn: 'I haven't made up my mind' on vote for president in November Trump acknowledged downplaying COVID-19 threat, says Woodward book MORE, acting chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, senior adviser to Mulvaney Robert Blair, and associate director for national security at the Office of Management and Budget Michael Duffey.

“Let me be clear: I do not know what their answers would be, but I want to hear from them, and so should every senator and every American,” Jones wrote. “We cannot allow the full truth to evade this trial only to be revealed in some future memoir or committee hearing.”

Trump is accused of pressuring Kyiv to announce investigations that would have benefited him personally ahead of the 2020 election while withholding hundreds of millions of dollars in congressionally approved assistance to Ukraine. Earlier this month, the House approved two articles of impeachment against him: abuse of office and obstruction of Congress.

Jones called for Bolton to answer under oath questions about his role in withholding the aid, his leaving of his position earlier this year and his response to testimony from Fiona Hill, the former National Security Council senior director for Europe and Russia.

Republicans see Jones and Sen. Joe Manchin Joseph (Joe) ManchinOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency House Democrats tee up vote on climate-focused energy bill next week MORE (W.Va.) as the most likely Democrats to break party lines and vote to acquit the president.