The straws and other merchandise have contributed to a build up of new campaign donors who can be targeted when the presidential campaign gets into full swing.
Mr Trump’s re-election campaign and the Republican National Committee has already accrued $105 million in the second quarter of this year.
The donations can be spent on TV and digital advertising as well as grass roots campaigning, giving Mr Trump an early financial advantage over his Democratic opponents.
Mr Trump said on Tuesday he has also seen a groundswell in support from African American voters, as he hit back at claims of racism after attacking a Democratic congressman and his majority-black Baltimore district.
“They really appreciate what I’m doing, and they’ve let me know it,” he said as he left the White House.
Mr Trump has previously provoked criticism for attacking four Democratic congresswomen of colour, whom he tweeted should “go back” to their countries.
Mr Trump said on Tuesday he was “the least racist person there is”, adding “African American people love the job” he is doing.
Approval among black Americans has hovered around 10 per cent over the course of Mr Trump’s presidency, according to a Gallup poll.
However an independent Quinnipiac University poll also released on Tuesday found that 80 per cent of black voters say Mr Trump is racist. Among the general public, the figure falls to 51 per cent.