The people who started the campaign say that the balloon is a means to ensure that Trump "knows that all of Britain is looking down on him and laughing at him". Tens of thousands are expected to flood the streets in protest.
Meanwhile, Theresa May's government is nervously anticipating disruption from the guest himself.
Mr Trump has been branded "dangerous and inhumane" by Jeremy Corbyn.
Following the departure of senior figures, including foreign minister Boris Johnson and Brexit minister David Davis, the political atmosphere is febrile.
"It is in the interests of the U.K.to stand up and take a firm moral stance", said Zoe Gardner, a researcher and spokesperson of the Stop Trump Coalition, which is organizing protests this week in cities across the country.
"Give us your tired and your oppressed and we'll divide you from your children", he said mockingly of Mr. Trump's policies.
"I'm not for or against him coming, but I hope he doesn't come here and do something negative".
"I think they like me in the UK".
The reason: demonstrations are planned against President Donald Trump, in London, as well as Windsor, Bristol, Newcastle, Leeds, Cambridge, Cardiff, Glasgow and the west coast of Scotland, where Trump has a golf course.
Theresa May hit by new Brexiteer rebellion over Chequers plans
That will infuriate many Brexiteers - indeed, it is what forced David Davis , Boris Johnson and Steve Baker to quit Government. Effectively staying in the single market for goods, but not services, is unlikely to be an attractive proposition for the EU.
Trump then angered May and many Britons by retweeting unverified, anti-Islamic videos from Britain First, whose leaders have been convicted of hate crimes.
May is trying to unify her deeply divided Conservative Party behind her Brexit plans with some of her own lawmakers openly speaking of a leadership challenge. "It's really kind of irrelevant to what we're trying to do, and doesn't express the opinion of the British people that I've met", he told the BBC's Today programme.
Trump has done more damage to North Atlantic Treaty Organisation in months than Russian Federation has in decades Trump takes credit for increased defense spending by North Atlantic Treaty Organisation allies, but says "it isn't almost enough" Trump questions how Russian Federation probe can "proceed" given Federal Bureau of Investigation agent's private comments MORE on Thursday downplayed expected protests during his visit to the United Kingdom, saying he believes its citizens "like me a lot".
More than 60,000 people have signed up to demonstrate in London on Friday when protesters intend to fly a large balloon over parliament portraying Trump as an orange, snarling baby.
Winfield House has one of the largest private gardens in greater London, but it won't be possible to see the "Trump baby" balloon from its grounds. "Are you honestly saying that the right to protest, the right to assemble, the right to free speech is limited by the ridicule it might cause to someone else?"
"I'll have a cup of tea ready for him because he doesn't drink.", Mr Smyth said.
US President Donald Trump arrives in Britain on Thursday for talks with the leader of the United States' closest ally in Europe.
But it's not simply the protesters, who are expected to dog Mr. Trump throughout his visit, including his weekend in Scotland, but his fraught relationship with political leaders accustomed to harmonious exchanges with US leaders, a tradition of unity that goes back at least to the vital World War II partnership of Franklin D. Roosevelt and Winston Churchill. "They trust us on issues to do with nuclear missiles in a way that they don't trust any other country". Events will include "toss the welly at Trump" and a Trump coconut shy.