Sen. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) on Monday urged Republican lawmakers to tell President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE that it’s “unacceptable” to suggest the removal of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

During an interview with CNN’s “New Day,” Coons said the president’s recent barrage of attacks against the special counsel is “typical of a pattern we’ve seen” with Trump.

“It’s hard to know exactly what direction the president is taking,” Coons told CNN.

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“I think this is a time when all of us — Republicans and Democrats — need to stand up and make it clear that we’re committed to the rule of law and for the president or his lawyer to, even in jest, talk about firing Mueller or ending his investigation, is unacceptable,” he added.

Coons’s comments come after Trump unleashed a series of tweets over the weekend attacking Mueller's probe into possible collusion between Russia and the Trump campaign, former FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE and former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE.

McCabe, a longtime target of the president, was fired Friday by Attorney General Jeff Sessions. McCabe's dismissal came just days before the career FBI official was scheduled to retire.

Sessions said the FBI's Office of Professional Responsibility and Office of Inspector General (OIG) concluded that McCabe leaked information to the press and "lacked candor — including under oath — on multiple occasions."

Trump’s lawyer, John Dowd, on Saturday called upon Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE to “bring an end” to Mueller’s investigation.

"I pray that Acting Attorney General Rosenstein will follow the brilliant and courageous example of the FBI Office of Professional Responsibility and Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and bring an end to alleged Russia Collusion investigation manufactured by McCabe’s boss James Comey based upon a fraudulent and corrupt Dossier," said Dowd.

Last year, Coons proposed bipartisan legislation with Republican Sen. Thom Tillis (N.C.) aimed at protecting Mueller.