Answer:
That statement is False
Step-by-step explanation:
Lincoln stated the phrase “ America could not remain half slave and half free.” during his debate with Stephen A. Douglas. But at that time, he held the status as US Legislature, he never held the position as a Senator.
At the time, made that statement in order to highlight the division within the US government who at the time was torn apart over the issue of slavery. (representatives from the northern states mostly oppose slavery while representatives from southern states mostly support slavery)