Democratic Sen. Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (Del.) is requesting information from the Justice Department about why a career prosecutor was asked to resign days before Robert Mueller's special counsel investigation indicted former Trump campaign chairman Paul Manafort last week.

Reuters reported Wednesday that Coons is writing a letter to Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE to learn why Dana Boente was asked to quit in late October as the U.S. Attorney for the Eastern District of Virginia. That district has played a key role in the Mueller probe, Reuters wrote.

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“I‘m concerned about the abrupt departure of Dana Boente after a career as a federal prosecutor," Coons told Reuters. "There’s a lot of circumstances that connect the ongoing Mueller investigation to the Eastern District.”

Manafort was indicted last Monday along with a business associate on charges of tax fraud and money laundering. Mueller's special counsel office is investigating possible collusion between the Trump campaign and Russia, and has the authority to investigate any matters that arise from the probe.

Boente has served in a variety of roles for the Trump administration, including briefly working as acting deputy attorney general after Sally Yates was fired by Trump.

Sessions, according to Reuters, asked Boente to tender his resignation for the Eastern District in late October.

Boente will continue serving as the head of the Eastern District in Alexandria, Virginia until he is replaced and will step down as head of the National Security Division of the Justice Department once President Trump’s nominee, John Demers, is confirmed by the Senate.

Trump unveiled a seventh wave of judicial nominees in September, but has yet to nominate a replacement for Boente in Virginia. More than 100 vacancies existed in the judicial system as of last month.