Kamala was referring to the impeachment enquiry initiated against him for his dealings with Ukraine.
Earlier, in a video message on Twitter, Harris has said that she was finding it difficult to manage her campaign due to paucity of financial resources and vowed to continue her fight for the future of the country by defeating Trump.
The Democrat's withdrawal from the 2020 race marked the end of her bid for the top post that saw her poll numbers plummeting and fundraising performances drying up.
Watch: Donald Trump impeachment hearings set for December 4
Harris, who officially announced her candidacy for the US president in January this year, was seen as a front-runner for the top post even before beginning her campaign with a massive public gathering in her hometown Oakland in California.
However, she struggled to convert the early enthusiasm into a proper and sustained movement for the presidency and was criticised for her inability to articulate a vision on issues like healthcare, The Hill reported.
Harris' polling charts soared when she took on former Vice President Joe Biden in the first Democratic presidential debate in June. Since then, her campaign failed to gain traction and her polling numbers continued to sink.