According to the Dutch newspaper "De Volkskrant", Jeffers was able to access Trump's messages on Twitter, and was able to post tweets on the name of the US president, and to amend his personal data.
The Dutch "Jeffers" had previously succeeded in logging into the "Trump" account in 2016, by guessing the password, which is "yourefired" which means "you are fired".
This time he succeeded on the fifth attempt when he used the word "maga2020!", "Maga" is the slogan of the "Trump" campaign and an abbreviation for "Make America Great Again" which means "Let's make America great again."
The newspaper quoted "Jeffers" as saying: "I expected that my ban would occur after four failed attempts, or at least I would be asked to provide additional information, but the easy access to Trump's account indicates that the president did not use basic security measures such as two-step verification."
And the Dutch researcher's access to the "Trump" account on "Twitter" means that he was able to communicate with 87 million users, who are the number of followers of the "Trump" account.