Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE accused 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 of playing into Russian President Vladimir Putin's hands on Thursday when Trump goes after top officials at the FBI.

Biden told MSNBC's Andrea Mitchell that the Russian leader must be thinking "it's working" when he sees Trump attacking the law enforcement agency. Among the FBI officials Trump has criticized is former Deputy FBI 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, who resigned at the end of last month.

"What is Vladimir Putin's objective the last six to ten years?" Biden asked during the interview.

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"It is to delegitimize the west. Delegitimize them. So here you have the president of the United States of America saying that the single most important domestic law enforcement agency is not relevant, is not reasonable, is not honest, is not all those things," he continued.

"Putin must be sitting behind his desk going, 'It's working, man.'"

Trump and some Republicans have criticized the FBI and the Justice Department in recent months over both the Russia investigation and the now-closed investigation into Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE's private email server.

In January, Trump accused FBI agent Peter Strzok of "treason" in an interview with The Wall Street Journal, arguing the agent had plotted to undermine his presidency during the 2016 election.

Biden is said to be considering a presidential run against Trump in 2020 and has emerged as one of the president's most vocal critics in recent months.

Earlier in the week, the former vice president called Trump a "joke" after the president suggested that Democrats who didn't applaud his State of the Union address were acting "treasonous."

“I just marvel at some of the things he says and does. Like, what, two days ago, anybody [who] didn’t stand up and clap for him was un-American and maybe even treasonous,” Biden told CNN earlier this week.

“They say it was tongue-in-cheek; Democrats can’t take a joke,” host Chris Cuomo responded.

“Well, let me tell you, he’s a joke,” Biden shot back.