Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) in a recent interview said she won’t rule out a run for president in 2020.

During an interview Sunday with MSNBC’s “KasieDC,” Harris said that she is currently focused on 2018.

“I mean, listen, right now, I’m focused on this. I’m focused on a lot of other things,” Harris told host Kasie Hunt.

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But the host pressed Harris on a possible presidential bid. The senator has often been floated as a potential challenger to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in 2020.

“But you’re not ruling it out?” Hunt asked.

“I don’t know. I don’t know. I’m not ruling it out,” Harris responded.

Harris, 53, was elected to the Senate in 2016, taking over the seat vacated by Sen. Barbara Boxer Barbara Levy BoxerThe Hill's Morning Report - Presented by Facebook - Biden, Harris launch Trump offensive in first joint appearance Bottom line Polls show big bounce to Biden ahead of Super Tuesday MORE (D-Calif.) upon her retirement.

Harris has been a vocal critic of the president's immigration policies, including the recent "zero tolerance" policy at the border that caused the separation of children from their families.

Harris reportedly called the separations “a crime against humanity” after stopping at a detention facility last week.

Other Democratic senators have been floated as possible 2020 contenders, including Sens. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.).