Rep. Ted Lieu (D-Calif.) blasted Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court 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 HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings 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 TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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.