US President Donald Trump campaigned on Thursday in Iowa - the state that kicks off the presidential nominating race next week - basking in the support of his base while the US Senate trial considering his impeachment continued in Washington.

Donald Trump revives border wall promise in Iowa campaign speech, mocks Democrats

More than a year before the 2020 US presidential election, President Donald Trump and former Vice President Joe Biden went toe-to-toe in Iowa on Tuesday, trading barbs, testing their messages and providing a glimpse of a potential matchup between the two.

Trump, Biden show distinct styles in potential 2020 preview

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Donald Trump revives border wall promise in Iowa campaign speech, mocks Democrats

Trump, Biden show distinct styles in potential 2020 preview