Donald Trump has singled out plenty of his fellow GOP presidential candidates and his most recent target is Florida Senator Marco Rubio whom he calls “lazy” for skipping out on his day job.

Trump tweeted last week, “Rubio is totally owned by the lobbyists and special interests. A lightweight senator with the worst voting record in Senate. Lazy!”

On NBC’s the TODAY show Tuesday, Rubio dismissed the criticism, saying, “The majority of the job of being a senator isn’t walking onto the Senate floor and lifting your finger on a non-controversial issue and saying which way you’re going to vote. The majority of the work of a senator is the constituent service.”