LGBTQI people will gather at the site of Martin Luther King's 1963 I Have a Dream speech for a political rally aimed at preserving decades of progress while protesting setbacks under President Donald Trump.

After the festive nature of a parade on Saturday through the streets of Washington DC, the political demonstration could be the main event of the weeks-long WorldPride celebration, which moves around the globe every two years.

It occurs at the Lincoln Memorial at a time of high tension over LGBTQI rights in the US.

Speakers are certain to rail against Trump, who has issued executive orders limiting transgender rights, banned transgender people from serving in the armed forces and rescinded anti-discrimination policies for LGBTQI people.

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