Sen. Cory Booker (D-N.J.) in an interview on Sunday responded to calls from some Democrats to impeach President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE, saying lawmakers have to treat ongoing investigations into Russian election meddling "in a very sobered way."

"I’m not going to rush impeachment," Booker said on CNN's "State of the Union." "I think we need to deal with this in a very sobered way. This can’t be a relitigation of an election that is now past. This has to be about an objective assessment about the facts that are going on right now."

Booker's comments echo those of Democratic leaders, who have pushed back on calls by some party members to quickly begin the impeachment process against Trump.

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The president has faced mounting controversies in recent weeks, particularly surrounding ongoing federal investigations into possible collusion between his presidential campaign and Moscow.

For his part, Trump has denied any wrongdoing or coordination with Russian officials or agents, and has called the investigations a "witch hunt."

But he spurred backlash earlier this month when he fired FBI Director James Comey, who was, at the time, charged with overseeing his agency's Russia probe. Trump later told visiting Russian officials that firing Comey took "great pressure" off of him, because of the investigation.

Since then, the Justice Department has appointed former FBI Director Robert Mueller as special counsel to oversee the investigation.

Booker on Sunday applauded Mueller's appointment and called for Congress to establish an independent commission to conduct its Russia probe.

"All I know is I’m very satisfied that we have an independent investigation now going on through the Justice Department, as well as both houses ... seem to be moving, not as fast I’d like, but moving towards an independent congressional investigation," he said.