Bernie Sanders was in second place and Elizabeth Warren in third in the first batch of long-delayed results from the chaotic Iowa Democratic Party caucuses.
His campaign has all the momentum. But securing the nomination might prove harder than winning the presidency.
Iowa's first-in-the-nation caucuses were expected to provide some clarity for what has been a muddled nomination fight for much of the last year.
The Democratic-led House impeached Trump on Dec 18 on charges of abuse of power for asking Ukraine to investigate political rival Joe Biden and obstruction of Congress for blocking testimony and documents sought by lawmakers in their investigation.
Bernie Sanders drew a contrast with establishment favourite Joe Biden by noting Sanders fought a 2002 measure to authorise military action against Iraq. Elizabeth Warren and Sanders locked horns over his alleged statement "a woman can't defeat Trump.
While Trump cancelled financial support for Palestinians last year, Congress is now offering a $150 million aid package to them and also favours the two-state solution, an idea Trump seems unsure about.
A potential Bernie Sanders presidency could do wonders for race relations in the US and for its role in mediating conflicts globally.
Mark Esper won Senate confirmation by a vote of 90-8 and was sworn in at the White House by Supreme Court Justice Samuel Alito in a ceremony attended by Trump and several members of Esper's family.
President Donald Trump doubles down on his attacks against four minority US congresswomen and dismissed concerns that his comments were racist, prompting outrage from Democrats.
California Senator Kamala Harris took full advantage of the first debates between the nominees, changing the course of the presidential conversation within the Democratic fold.
The biggest US political debate since the 2016 presidential campaign is occurring over two nights in Miami, climaxing with former vice president Joe Biden squaring off against nine challengers, including number two candidate Bernie Sanders.
Democratic leaders in Congress argue that impeaching President Donald J. Trump is a political mistake as the 2020 election nears.
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