California Rep. Eric Swalwell Eric Michael SwalwellKamala Harris hits Trump on Fourth of July tweet: 'It’s America’s birthday, not his birthday' Dems mock Trump's pitch for Fourth of July celebration Pelosi's daughter slams NRA over 'target practice' article MORE (D) ripped the Trump administration on Saturday for claiming that Robert Mueller's special counsel office had obtained tens of thousands of emails from the Trump transition team illegally.

A lawyer for President Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE's transition team, Kory Langhofer, claimed earlier in the day that Mueller's team improperly obtained thousands of emails from the General Services Administration (GSA), which managed the transition team's email accounts.

Swalwell railed against the claim on Twitter.

"'Private documents' on a US Government, public email system? What are they afraid was found? Baloney. This is another attempt to discredit Mueller as his #TrumpRussia probe tightens," Swalwell tweeted.

“Private documents” on a US Government, public email system? What are they afraid was found? Baloney. This is another attempt to discredit Mueller as his #TrumpRussia probe tightens. https://t.co/VZTkwiGmoB… https://t.co/q0HTbwpQRK — Rep. Eric Swalwell (@RepSwalwell) December 16, 2017

A letter sent from Langhofer to several congressional committees says the GSA “unlawfully produced [the transition team's] private materials, including privileged communications, to the Special Counsel’s Office."

Langhofer's letter also calls on Congress "to protect future presidential transitions from having their private records misappropriated by government agencies, particularly in the context of sensitive investigations intersecting with political motives.”

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Swalwell, who sits on the House Intelligence Committee, has upped his rhetoric against Trump and his associates regarding the Russia probe in recent weeks.

In early December, Swalwell said that Trump's former campaign chairman Paul Manafort Paul John ManafortMatt Schlapp says Trump has hired 'some stinkers' in past Manafort's attorneys say he should get less than 10 years in prison The Hill's 12:30 Report: Trump looks for boost from Korea summit MORE was guilty of "treason" after news surfaced that Manafort drafted an op-ed with a Russian associate with ties to the Kremlin.

“The nerve. At this point, let’s just call this what it is, treason,” Swalwell wrote on Twitter. “He’s out on bail in the #TrumpRussia investigation and he’s giving comfort and aid to an enemy.”

Manafort was charged in late October under Mueller's special counsel investigation with tax fraud and money laundering, along with a business associate, Richard Gates. He has denied the charges.