Some folks on Twitter took this as a threat to out Booker, who is unmarried. The Hill reports on the tweet:
Republican presidential nominee Donald Trump quickly fired back at Sen. Cory Booker’s (D-N.J.) speech Monday night at the Democratic National Convention in Philadelphia with a cryptic tweet.
Trump criticized Booker, who was considered to be a top contender for Hillary Clinton’s vice president, tweeting: “If Cory Booker is the future of the Democratic Party, they have no future! I know more about Cory than he knows about himself.”
Booker, a rising star in the Democratic Party, took the stage Monday before first lady Michelle Obama and Sens. Elizabeth Warren (D-Mass.) and Bernie Sanders (I-Vt.). His speech, which he used to assail Trump, was well-received by the party faithful.