What does 1 Kings 2:22 mean?

King Solomon answered his mother, 'Why are you asking for Abishag for Adonijah? You might as well ask for the kingdom for him—he's my older brother! And Abiathar the priest and Joab son of Zeruiah are on his side.' 1 Kings 2:22 - Modern Text Bible

(Solomon sees the request as a threat to his rule, since marrying Abishag could be seen as a claim to the throne.)