The Reagan-era director of the FBI, and later the CIA, is urging the Senate to reject two of President-elect Trump's selections for top law enforcement and intelligence posts.

In a letter to senators on Thursday reported by Politico, former FBI and CIA director William H. Webster wrote that Kash Patel and Tulsi Gabbard are unqualified to be FBI director and director of national intelligence, respectively.

Webster, who is 100 years old, is the only person to have led both the FBI and CIA. He warned senators that Patel's personal loyalty to Trump could conflict with the FBI's duty to uphold the rule of law.

"His record of executing the president’s directives suggest [sic] a loyalty to individuals rather than the rule of law — a dangerous precedent for an agency tasked with impartial enforcement of justice," he wrote, according to Politico.

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William H. Webster

William H. Webster, a former director of the FBI and the CIA, is the only man to have ever held both positions.    (Universal History Archive/Universal Images Group via Getty Images)

As for Gabbard, Webster criticized her "profound lack" of intelligence experience and said a seasoned leader is needed for the DNI post. 

"Effective management of our intelligence community requires unparalleled expertise to navigate the complexities of global threats and to maintain the trust of allied nations," he wrote. "Without that trust, our ability to safeguard sensitive secrets and collaborate internationally is severely diminished."

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Judge William Webster, former FBI and CIA director

Judge William Webster, former FBI and CIA director, looks on before a game between the Atlanta Braves and Washington Nationals at Nationals Park in Washington, D.C., on Aug. 7, 2018. (Patrick McDermott/Getty Images)

The Trump transition team defended the president-elect's selection of Patel to lead the FBI. 

"Kash Patel is loyal to the Constitution. He’s worked under Presidents Obama and Trump in key national security roles," said Alex Pfeiffer, a Trump transition team spokesman. 

Another transition official, Alexa Henning, observed that Webster had supported President Biden and Vice President Kamala Harris against Trump. 

"Lt. Col. Gabbard is an active member of the Army and has served in the military for over two decades and in Congress. As someone who has consumed intelligence at the highest levels, including during wartime, she recognizes the importance of partnerships with allies to ensure close coordination to keep the American people safe," said Henning. 

Patel and Gabbard have proven to be two of Trump's more controversial nominees for key positions in his next administration. 

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Kash Patel and President-elect Donald Trump

President-elect Trump nominated Kash Patel as FBI director.  (Getty Images)

Patel was the chief investigator in the congressional probe into alleged Trump-Russia collusion, uncovering government surveillance abuse that led to the appointment of two special counsels who determined that there was never any collusion and the premise of the FBI's original investigation was bogus. He has raised concern among top law enforcement professionals for his outspoken criticism of the FBI and Justice Department, accusing them of partisanship. 

Gabbard, a former Democratic congresswoman and military officer from Hawaii, is likewise under scrutiny after she met with since-toppled Syrian dictator Bashar al-Assad in 2017, who was accused of using chemical weapons on his own citizens during the country's civil war. Gabbard refused to call him a war criminal during her 2020 presidential campaign and said she was skeptical that his government had perpetrated a chemical weapons attack earlier that year that had killed dozens of Syrians. However, she later called Assad a brutal dictator. 

Tulsi Gabbard

Tulsi Gabbard, President-elect Trump's pick to be director of national intelligence, arrives to meet with several Republican senators on Capitol Hill in Washington, D.C., on Dec. 16. (Jack Gruber/USA Today Network via Imagn Images)

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Webster was appointed to direct the FBI by President Jimmy Carter in 1978, and he remained atop the bureau under President Ronald Reagan's two terms in office. In 1988, Webster became director of the CIA under President George H.W. Bush and served through 1991.

"I urge you to weigh the critical importance of nonpartisan leadership and experience," Webster wrote. "The safety of the American people — and your own families — depends on it."

Fox News' Brooke Singman and Michael Dorgan contributed to this report.