The suspected poisoning incident occurred a few miles away from where former Russian spy Sergei Skripal and his daughter were attacked with a nerve agent.
"This form of abuse is painful and humiliating for victims and often has a devastating impact on all aspects of their lives," one campaigner said.
The organizers are rallying against policies including the transgender military ban.
The goal is to raise awareness about the link between obesity and cancer.
Trump said the U.K.'s National Health Service was "going broke and not working" on Monday.
The procedure allows mothers to avoid passing serious genetic conditions to their children.
General Sir Nick Carter warned the British government about further cuts to its armed forces.
The smuggling of unvaccinated dogs as young as 4 weeks old has become a big business in Britain.
The president said his London trip was canceled because he didn't like the new diplomatic mission building.
The president is upset about a "bad deal" made in 2008.
Explosive Michael Wolff book says the former British leader sought to be a Middle East adviser to the president.
Of 80 graves excavated on site, this was the only one to contain artifacts of this kind.
The alliance is concerned about Moscow's presence near undersea communication lines.
British security services said Trump's policy on torture, if enacted, would "pose difficulties for the U.K.-U.S. intelligence relationship."