Senate Minority Whip Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.) on Sunday said there are "so many questions" about why President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE is "so chummy" with Russian President Vladimir Putin.

"This man who is a former KGB agent, never been a friend of the United States, invaded our allies, threatens us around the world and tries his damnedest to undermine our elections. Why is this President Trump’s best buddy? I don’t get it," Durbin said during an interview on ABC's "This Week."

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"And when he take the interpreter’s notes and wants to destroy them so no one can see what was said, it raises serious questions about the relationship between this president and Putin," Durbin added.

Asked if he believes it's possible that President Trump has been compromised by Russia, Sen. Dick Durbin tells @GStephanopoulos there are "serious questions" about why Trump is "so chummy" with Russian President Vladimir Putin https://t.co/P6iz1j1VA4 #ThisWeek pic.twitter.com/0V2x6e7Xri — This Week (@ThisWeekABC) January 13, 2019

Durbin was referencing a Washington Post story published Saturday revealing that Trump has worked to hide the details of his private conversations with Putin, including by taking notes from an interpreter following a 2017 meeting with the Russian leader.

The Post story was published a day after The New York Times reported that the FBI in 2017 opened an investigation into whether Trump was working on behalf of Russia. The probe was reportedly prompted when Trump fired former FBI Director James Comey James Brien ComeyTrump jabs at FBI director over testimony on Russia, antifa Graham: 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' MORE.