Democrats should not stop investigating 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 over his threats to end work with them on legislation, 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.) said Wednesday in an appearance on "The Late Show with Stephen Colbert Stephen Tyrone ColbertColbert implores Pelosi to update 'weaponry' in SCOTUS fight: 'Trump has a literal heat ray' The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Juan Williams: Democrats need to bury their divisions MORE."

The presidential candidate said it would be wrong for her party to cave to Trump.

"He's going to hold America's infrastructure hostage ... over the issue of the investigation," Harris said.

ADVERTISEMENT

"The roads are falling apart," she added. "Families are suffering."

Colbert asked Harris why Democrats don't just temporarily "pause" the investigations, adding that Trump will "still be corrupt later."

"We cannot abandon our Democracy for the sake of appeasing somebody who is completely focused on his interests only," Harris responded.

Trump vowed to quit working with Democrats on infrastructure and walked out of a meeting at the White House with congressional leaders after Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) minutes before the meeting accused him of being involved in "a cover-up."

Pelosi was referring to Trump's refusal to provide documents or have witnesses appear at the request of Democrats investigating his administration.

Harris is among two dozen people vying for the Democratic Party's 2020 presidential nomination.

She has lagged behind former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE and Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (D-Vt.) in polls, but hopes to begin a climb with a "phase two" of her campaign.