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"Not my president" was a rallying cry being called out across America on mattress sex videosWednesday night.

Thousands of U.S. citizens opposed to Donald Trump have taken to the streets, after it was announced the Republican candidate had won the U.S. election. From west to east and even across the seas, major cities are seeing people turn out in droves.

SEE ALSO: This is how the world leaders reacted to Trump's election

Tens of thousands of protesters have hit the streets of some of the nation's cities, and there was protesting in London, UK.

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In New York City, 6th Avenue has been reportedly closed down, as people move between Trump Tower and Union Square.

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Credit: Getty Images

There have been no confirmed reports of rioting or arrests, although at least one group of people were seen burning a U.S. flag.

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At least a thousand protesters are marching through Chicago, after gathering outside Trump Hotel and Trump Tower downtown. Police have also closed roads in the area, according to Al Jazeera.

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"No Trump! No KKK! No racist USA," and "Say it loud! Say it clear! Refugees are welcome here!" are among the chants rising above crowds in the cities.

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But even in other places, from San Francisco to Los Angeles, Portland and Seattle, to Boston where an estimated 10,000 people have gathered -- "Not my president!" is the stand-out message from protesters.