Because he put political power and loyalty before every other consideration, as Republicans always do.
According to tradition, the table talk should include religious discussion and consideration of holy texts.
Republican leaders said they did it to protest what they saw as a lack of consideration for their proposed amendments.
mid-14c., "a beholding, looking at," also "keeping in mind," from Old French consideracion (12c., Modern French considération), from Latin considerationem (nominative consideratio) "consideration, contemplation, reflection," noun of action from past participle stem of considerare (see consider). Meaning "a taking into account" is from mid-15c.; that of "something given in payment" is from c.1600.