Senate panel requests info on Trump aides for Russia probe
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Top members of the Senate Judiciary Committee are expanding their probe into Russia's election meddling, asking for details on the communications of two Trump campaign aides.

Sens. Chuck GrassleyCharles (Chuck) Ernest GrassleyScandal in Puerto Rico threatens chance at statehood Poll: McConnell is most unpopular senator Democrat: Treasury 'acknowledged the unprecedented process' in Trump tax return rejection MORE (R-Iowa) and Dianne FeinsteinDianne Emiel FeinsteinTop Democrats demand security assessment of Trump properties Democrats warm to idea of studying reparations Hillicon Valley: Senators unload on Facebook cryptocurrency plan | Trump vows to 'take a look' at Google's ties to China | Google denies working with China's military | Tech execs on defensive at antitrust hearing | Bill would bar business with Huawei MORE (D-Calif.) — the chairman and ranking member of the committee, respectively — sent a letter to the Trump campaign asking for documents related to John Mashburn and Rick Dearborn.

"The Committee has determined that obtaining their responsive emails, or at least ensuring that adequate searches have been conducted that would cover these communications, is necessary for its investigative work," Grassley and Feinstein wrote.

They noted they are sending the request because they "believe information obtained in a recent Committee interview warrants expanding those searches to two additional custodians who were not included in the original effort, John Mashburn and Rick Dearborn."

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Mashburn, who currently serves as a deputy Cabinet secretary, worked as a policy director on the Trump campaign. Dearborn, who announced late last year that he was leaving the White House, also worked on the campaign and the transition team. 

The Senate committee has been looking into Russian interference in the 2016 election since last year.

Feinstein and Grassley noted they sent a letter in July 2017 asking for documents. So far, they said, the campaign has "provided over 28,000 pages of responsive documents, as well as letters detailing the 21 campaign custodians whose emails were searched and the more than 300 search terms used." 

Grassley, Feinstein and Sens. Sheldon WhitehouseSheldon WhitehouseHillicon Valley: Trump seeks review of Pentagon cloud-computing contract | FTC weighs updating kids' internet privacy rules | Schumer calls for FaceApp probe | Report says states need more money to secure elections Senate passes bill making hacking voting systems a federal crime Overnight Energy: Scientists flee USDA as research agencies move to Kansas City area | Watchdog finds EPA skirted rules to put industry reps on boards | New rule to limit ability to appeal pollution permits MORE (D-R.I.) and Lindsey GrahamLindsey Olin GrahamScarborough sounds alarm on political 'ethnic cleansing' after Trump rally The Hill's Morning Report: Trump walks back from 'send her back' chants GOP rattled by Trump rally MORE (R-S.C.) sent letters last year to the Trump campaign, the Trump Organization and Donald Trump Jr.Donald (Don) John TrumpThe Hill's Morning Report — Trump retreats on census citizenship question Trump set to host controversial social media summit Trump associate Felix Sater grilled by House Intel MORE, President TrumpDonald John TrumpCould Donald Trump and Boris Johnson be this generation's Reagan-Thatcher? Merkel backs Democratic congresswomen over Trump How China's currency manipulation cheats America on trade MORE's eldest son, asking for a slew of information about potential contacts with Russian officials, attempts to obtain damaging information on Democratic candidate Hillary ClintonHillary Diane Rodham ClintonPoll: Majority of Democratic voters happy with their choices among 2020 contenders No presidential candidate can unite the country GOP lawmakers speak out against 'send her back' chants MORE and a 2016 Trump Tower meeting with a Russian lawyer offering information on Clinton. 

They also sent letters at the time to Paul ManafortPaul John ManafortWebb: Questions for Robert Mueller Top Mueller prosecutor Zainab Ahmad joins law firm Gibson Dunn Russian oligarch's story could spell trouble for Team Mueller MORE — Trump's former campaign manager — and Glenn Simpson, whose Fusion GPS research firm commissioned the controversial "dossier" on Trump and Russia. 
 
Thursday's joint Grassley-Feinstein letter comes as the Judiciary Committee's probe into Russia's election meddling has grown increasingly fractured in recent months. 
 
Democrats believe the committee should be focused on potential collusion between Moscow and the Trump campaign, as well as then firing of former FBI Director James ComeyJames Brien ComeyFBI's spreadsheet puts a stake through the heart of Steele's dossier Hannity invites Ocasio-Cortez to join prime-time show for full hour The Hill's 12:30 Report: Acosta under fire over Epstein plea deal MORE
 
Republicans, meanwhile, are digging into actions under the Obama administration, including the FBI's handing of its Russia probe and a separate investigation on Clinton's private email server.