What was the problem with lame ducks in congress?

Im going to assume its because a "lame duck" session only happened when congress meets after a election.

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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our current president donald trump