Vice President Biden might have had the late Sen. Frank Lautenberg (D-N.J.) on his mind Thursday at the swearing-in ceremony for former Newark Mayor Cory BookerCory Anthony BookerDHS chief takes heat over Trump furor Booker to Nielsen: 'Your silence and your amnesia is complicity' Homeland Security secretary grilled over Trump comments MORE (D).

The VP was overheard referring to another Garden State politician with a one-syllable first name, Sen. Robert MenendezRobert (Bob) MenendezCongress must provide flexible funding for owners of repeatedly flooded properties Senate ethics panel resumes Menendez probe after judge declares mistrial Judge declares mistrial in Menendez bribery case MORE (D), as “Frank” while Booker was being sworn into the Senate.

"Come on up here, Frank," Biden said to Menendez, before correcting himself, "Bob."

Just moments earlier, Biden noted that Senator-elect Booker won the vote to replace Lautenberg, who died in June at the age of 89.