Donald Trump has responded to so-called "No Kings" rallies with an AI video of himself in a fighter jet, pouring brown sludge over protesters.

Millions of people were expected to take part in the demonstrations this weekend - the second such gathering after an initial nationwide day of protest in June coinciding with the US president's birthday.

The term "No Kings" reflects the belief by some that Mr Trump is behaving like a "king" and some in his administration are depicting him as a monarch.

On Sunday, the president shared the AI video on his social media platform, Truth Social.

In the clip, an AI-generated version of Mr Trump is wearing a crown and sitting in a jet with "King Trump" written across it, to the soundtrack of Kenny Loggins' Danger Zone, from the film Top Gun.

The jet then drops thick brown sludge on to AI-generated protesters.

Supporters say the marches are a patriotic defence of free speech, while critics are calling them anti-American.

Mr Trump's Republican Party has dismissed the demonstrations as "Hate America" rallies.

Many of the events featured marching bands, huge banners and signs, as well as effigies of the president and demonstrators wearing inflatable costumes.

The protests follow Mr Trump's return to the White House and come against the backdrop of a government shutdown which has closed federal programmes and services.

There has also been criticism of what some see as an aggressive executive, confronting Congress and the courts, in ways that protest organisers believe are a slide toward authoritarianism.

So far, the atmosphere at most of the protests appears to have been largely energetic and upbeat, with protesters calling for accountability and protections for civil liberties.

Organisers said events would be peaceful - a direct response to Republican and Trump administration claims that the protests could be unsafe.