Rep. Ted Lieu (D-Calif.) blasted Sen. John Cornyn John CornynHillicon Valley: Senators urge Trump to bar Huawei products from electric grid | Ex-security officials condemn Trump emergency declaration | New malicious cyber tool found | Facebook faces questions on treatment of moderators Key senators say administration should ban Huawei tech in US electric grid Senate plots to avoid fall shutdown brawl MORE (R-Texas) on Saturday for "partisan talk" about special counsel Robert Mueller's office and the FBI.

Lieu tweeted that Cornyn needed to "shut up" about the integrity of agents on Mueller's team unless he also had a problem with FBI Director Christopher Wray's political donations to Republicans.

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"Dear @JohnCornyn: FBI Director Christopher Wray gave over $39,000 exclusively to Republicans. Are you okay with that?" Lieu asked. "Because if you are, then you need to shut up with the partisan talk about our dedicated, professional and patriotic FBI officials."

Dear @JohnCornyn: FBI Director Christopher Wray gave over $39,000 exclusively to Republicans. Are you okay with that? Because if you are, then you need to shut up with the partisan talk about our dedicated, professional and patriotic FBI officials. https://t.co/Hr5hDcVyn1 — Ted Lieu (@tedlieu) December 16, 2017

Lieu's remarks came in response to a tweet from Cornyn, the No. 2 Senate Republican, calling on Mueller to "clean house" and remove partisans from his team. Cornyn also rebuked former Attorney General Eric Holder Eric Himpton HolderObama political arm to merge with Holder-run group Barack, Michelle Obama expected to refrain from endorsing in 2020 Dem primary: report Ocasio-Cortez to be first guest on new Desus and Mero show MORE for tweeting that any attempt to remove Mueller would not be tolerated.

Cornyn's tweets came after text messages revealing anti-Trump comments from a former member of Mueller's team were revealed.

But Mueller needs to clean house of partisans https://t.co/g8SwgAKtfH — Senator JohnCornyn (@JohnCornyn) December 16, 2017

Speculation has continued for months over whether President Trump Donald John TrumpHouse committee believes it has evidence Trump requested putting ally in charge of Cohen probe: report Vietnamese airline takes steps to open flights to US on sidelines of Trump-Kim summit Manafort's attorneys say he should get less than 10 years in prison MORE will push to fire Mueller as the federal probe has ensnared several former members of Trump's campaign.

Democrats have said that any attempt by the White House or Congress to interfere with the special counsel investigation would be unacceptable.