US President Donald Trump speaks to reporters before leaving the White House in Washington D.C. the United States, on Aug. 2, 2019. (Photo by Ting Shen/Xinhua)

US House Speaker Nancy Pelosi said on Saturday that public opinion is now on the side of an impeachment inquiry against President Donald Trump following the release of new information about his conversations with Ukrainian President Volodymyr Zelenskiy.

Pelosi this week announced her support for an investigation after the surfacing of a whistleblower complaint that said Trump appeared to solicit a political favor from Ukraine's president aimed at helping him be re-elected next year.

Pelosi for months took a cautious approach in weighing the calls of other Democratic House members to launch impeachment proceedings against Trump, which grew louder after former Special Counsel Robert Mueller testified on July 24 about his probe of Trump and Russian interference in the 2016 election.

"In the public, the tide has completely changed; it could change now - who knows - but right now after seeing the complaint and the IG (Inspector General) report and the cavalier attitude the administration had towards it, the American people are coming to a different decision," Pelosi said at a journalism event hosted by the Texas Tribune news website.

She added that her resistance to holding an impeachment inquiry quickly evolved from urging that fellow Democrats remain cautious of the political fallout ahead of next year's elections to full steam ahead as details emerged of Trump's dealings with Ukraine's leader.

"A president of the United States would withhold military assistance paid for by taxpayers to shake down the leader of another country unless he did him a political favor - that is so, so clear," Pelosi said.