U.S. House Speaker Nancy Pelosi is amplifying her unfavorable comparison of President Donald Trump to fellow Republican Richard Nixon, saying that disgraced president at least cared enough about the country to leave office before his impeachment.

The top Democrat in Congress told reporters last week that Trump's pressure on Ukraine to investigate one of his potential opponents in the 2020 election "makes what Nixon did look almost small."

In a CBS interview broadcast on Sunday, she alluded to Nixon's resignation after the Watergate scandal involving a break-in at Democratic Party headquarters and the subsequent cover-up.