Sen. Cory Booker (D-N.J.) said late Wednesday that it is “very problematic” that President Trump and Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE were involved in the firing of FBI Director James Comey.

“I think it’s very problematic when you have a president, and an attorney general, involving themselves ... in a firing of an individual that was asking for more resources in fact to investigation, not only the Russia attacks, cyberattacks, but also of people that were part of the campaign, as Jeff Sessions was and obviously as candidate Trump was,” Booker told CNN’s “Erin Burnett OutFront.”

Trump reportedly asked Sessions and Deputy Attorney General Rod Rosenstein to provide a written rationale for firing Comey. The FBI director had been leading the investigation into any potential ties between Trump’s campaign staff and Russia.

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Booker, a member of the Senate Foreign Relations Committee, said it is time for the U.S. to resume its focus on the probe into Russia’s meddling in the presidential election.

“And so this really, we have to get back to the focus of what’s going on right now which is really a moment in American history where we’ve had an unprecedented attack on our elections and how are we as a nation going to respond,” Booker said.

Trump fired Comey on Tuesday, saying it was it was time for “a new beginning” at the bureau.