The BBC explains:
A critic of President Trump has taken advantage of a Twitter typo by his lawyer, Rudy Giuliani, to mount an attack. Mr Giuliani left out a space between a full stop and the following word within a tweet, which caused the text to become a link.
The prankster subsequently acquired the webpage it directed users to. There, they posted a brief message saying: “Donald J Trump is a traitor to our country.”
Mr Giuliani’s tweet – which has been “liked” more than 39,000 times and retweeted more than 14,000 times – is still live, at the time of writing, four days after being created. Twitter turns text into a hyperlink only if it recognises the letters after a full stop as representing an established top-level domain (TLD) name.
Mueller filed an indictment just as the President left for https://t.co/8ZNrQ6X29a July he indicted the Russians who will never come here just before he left for Helsinki.Either could have been done earlier or later. Out of control!Supervision please?
— Rudy Giuliani (@RudyGiuliani) November 30, 2018
Twitter allowed someone to invade my text with a disgusting anti-President message. The same thing-period no space-occurred later and it didn’t happen. Don’t tell me they are not committed cardcarrying anti-Trumpers. Time Magazine also may fit that description. FAIRNESS PLEASE
— Rudy Giuliani (@RudyGiuliani) December 5, 2018
Tonight’s episode of “Grampa Can’t Understand the Internet” is *horrible*
— Kevin M. Kruse (@KevinMKruse) December 5, 2018
Wow are you a moron.
— andy lassner (@andylassner) December 5, 2018
Sorry, Rudy… you weren’t supposed to get that. Running some tests on the Soros-funded Deep State emergency SMS notification system rn…
— William LeGate (#DeepState CyberSec) (@williamlegate) December 5, 2018
— Erick Fernandez (@ErickFernandez) December 5, 2018
Someone merely capitalised on your bumbling illiteracy. You’re painting it as some sort of orchestrated leftwing Twitter conspiracy. You got outsmarted and humiliated which, let’s face it, isn’t difficult.
— Mike P Williams (@Mike_P_Williams) December 5, 2018