President Donald Trump's former campaign manager says Democrats need to nominate a Washington outsider to compete in 2020.

Corey Lewandowski says former New York City mayor Michael Bloomberg would instantly become a serious challenger to Trump if he ran as a Democrat.

Former Trump Campaign Manager Says Bloomberg Is 2020 Threat

Lewandowski, now an adviser to Vice President Mike Pence's Great America PAC, says the billionaire media mogul has a personal narrative that mirrors Trump's and is "an American success story."

Former Trump Campaign Manager Says Bloomberg Is 2020 Threat

Bloomberg is founder and CEO of Bloomberg L.P., a global media company. He served three terms as New York City mayor and has variously been a Democrat, Republican and Independent. He twice flirted with running for president as an independent candidate, but ruled it out.

Former Trump Campaign Manager Says Bloomberg Is 2020 Threat

Lewandowski spoke with reporters Wednesday at a Christian Science Monitor breakfast.