James Comey’s testimony before the Senate Intelligence Committee raises questions about whether President Donald Trump obstructed justice by firing the FBI director, said former Assistant Attorney General John Carlin.

“Whether or not someone obstructs justice … you look at their intent: Were they corruptly trying to influence an investigation?” Carlin told CNBC’s “Squawk Box” on Thursday.

During the Obama administration, Carlin was assistant attorney general from 2014 to 2016 and was chief of staff to Robert Mueller when the latter was FBI director. Last month, Mueller was appointed by the Justice Department as special counsel in charge of the investigation into allegations that Russia interfered with the 2016 election.

In written testimony released Wednesday, Comey recounted an interaction with Trump in which the president allegedly said“I need loyalty.” Comey also described a request from Trump to “lift the cloud” of the Russian inquiry. But the former FBI director also confirmed he told the president three times he was not under investigation.

Trump’s personal lawyer Marc Kasowitz said, “The president is pleased that Mr. Comey has finally publicly confirmed his private reports that the president was not under investigation in any Russian probe.” The statement also said, “The president feels completely and totally vindicated. He is eager to continue to move forward with his agenda.”

Carlin said Comey’s scheduled appearance before the Senate committee on Thursday morning is a “historical event.”

“You got to look at it all together as a package,” said Carlin. “All these acts together — including and most significantly firing the man in charge of the investigation — was [Trump] doing that because he wanted to influence the investigation because he didn’t like the way it was going?”

The decision is up to Congress as “judge and jury,” said Carlin. “Under current Justice Department guidance, the special counsel, my former boss Bob Mueller, he can’t bring a charge against the sitting president.”

Carlin, who currently chairs Morrison & Foerster’s global risk and crisis management team, said there’s a lot at stake because obstruction of justice was among the charges in President Bill Clinton’s impeachment and among the charges levied against President Richard Nixon.

In December 1998, Clinton was impeached by the House on charges stemming from the Monica Lewinsky affair. Clinton remained in office after an acquittal by the Senate. For his part, Nixon resigned in August 1974 as impeachment proceedings were underway.

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