Former acting Attorney General Sally Yates Sally Caroline YatesSally Yates: If Trump doesn’t talk to Mueller he doesn’t have ‘moral authority to lead’ Ex-acting deputy AG Boente was asked to interview with Mueller: report Sally Yates blasts Trump for 'relentless attack on democratic institutions and norms' MORE ripped President Trump Donald John TrumpInfowars' Alex Jones blasts Trump over airstrikes: 'He's crapping all over us' McCain to Trump: Airstrikes alone won't achieve objectives in Syria Top general: US did not notify Russia on Syria targets MORE in a rare tweet on Saturday, warning him not to fire Deputy Attorney General Rod Rosenstein Rod Jay RosensteinHouse chairmen ask Rosenstein for copies of Comey memos MSNBC's Katy Tur challenges GOP rep to answer question without using Clinton's name NY prosecutors blast Cohen request on seized evidence MORE.

Yates wrote that firing Rosenstein would effectively be the same as firing Special Counsel Robert Mueller Robert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE, since Rosenstein appointed Mueller and oversees his investigation into whether the Trump campaign colluded with Russia.

"Make no mistake about what’s at stake here: firing Rosenstein would be the same unconscionable assault on the rule of law as firing Mueller," she wrote. "He controls scope of the Mueller investigation and what becomes public. Both D’s and R’s should reject sham excuses to fire Rosenstein.

Make no mistake about what’s at stake here: firing Rosenstein would be the same unconscionable assault on the rule of law as firing Mueller. He controls scope of the Mueller investigation and what becomes public. Both D’s and R’s should reject sham excuses to fire Rosenstein.1/2 — Sally Yates (@SallyQYates) April 14, 2018

"And you can’t fire a prosecutor because you’re unhappy he approved a search warrant that relates to your own conduct," she added in a second tweet. "No one is above the law."

2/2 And you can’t fire a prosecutor because you’re unhappy he approved a search warrant that relates to your own conduct. No one is above the law. — Sally Yates (@SallyQYates) April 14, 2018

Speculation has been building that Trump may be preparing to fire Rosenstein in response to the FBI raid on Trump's lawyer's office, which Rosenstein personally signed off on. The deputy attorney general is the only person with the authority to fire Mueller.

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Rosenstein has reportedly been telling people that he is prepared to be fired.

Yates, a harsh critic of Trump, also said Friday that if Trump does not sit down for an interview with Mueller, he does not "have the moral authority to lead."

Trump fired Yates soon after taking office after she refused to uphold his controversial travel ban executive order.