Sen. Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (D-Calif.) said Thursday that Senate investigators could seek testimony from 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 amid probes into ties between his campaign and Russia during the 2016 presidential campaign.

"I think it's possible, yes," Harris said when MSNBC's Ari Melber asked if the Senate could seek Trump's testimony.

Donald Trump Jr., the president's eldest son, answered questions for over five hours on Thursday in a closed-door interview with Senate investigators regarding his now-infamous June 2016 meeting with a Russian attorney.

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During his interview with Senate Judiciary Committee staff, Trump Jr. said he had met with the attorney in an effort to assess then-Democratic presidential nominee 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 "fitness" for office, as she was running against his father.

Harris, a former California prosecutor and member of the Senate Intelligence Committee, had previously interviewed 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 as part of the probe into possible collusion between Russia and the Trump campaign.

When asked under what conditions President Trump would be brought before the Senate to testify, Harris said, "We'll see where the facts lead us."