The Lord of the Rings star shared his thoughts about the 45th President of the United States in a lengthy post after he took to the streets of the English capital for the protest against Trump's stance on women's issues.

Explaining that the word "trump" means "to break wind" in the U.K., MCKellen wrote. He did not use Trump's name in the post but cheekily dubbed the new occupant of the White House "President Breaking Wind".

"(He) has impacted us all; and personally,” the 77-year-old actor wrote. “Some like him, think they can identify with him, believe him because they’ve seen him on television perhaps and think the billionaire and his billionaire team are truly friends.

"The rest of us, including the majority of voters in USA, see through the charade: after all, the schtick is not exactly subtle. But he’s riled us, got under our skin, making us angry and despairing that he should have got through to the final of his show and turned democracy into a tv/twitter spectacular," he added.

And noting the official White House website removed its LGBT (lesbian, gay, bisexual, and transgender) page after Trump was sworn in on Friday (20Jan17), the openly gay star speculated about what horrors the future might hold.

"What will happen? No doubt his believers will be soon disillusioned,” MCKellen wrote. “The rest of us cannot let him reign unchallenged. The Marches worldwide were a good beginning. Some who fear him say ‘give the man a chance.’ OK - he’s started by removing LGBTQ people, climate change, and state funding of the arts from POTUS’s (President of the United States) website. He’s had his chance.”

The actor was snapped on Saturday during the Women's March in London holding a sign featuring a photograph of his friend Patrick Stewart with his head in his hands while in character as Captain Picard from Star Trek.

MCKellen insisted he didn’t actually make the sign but found it at the end of the march.

Saturday's biggest Women's March took place in Washington, D.C. and featured celebrity speakers including Madonna, Scarlett Johansson and Michael Moore.

There were other marches and rallies across the U.S. and all around the globe.