"A second Senate Republican aide warned that the National Republican Senatorial Committee (NRSC) might have to divert resources away from trying to capture Democratic-held seats in 10 states that Trump carried last year. “Every dollar the NRSC puts into protecting Republican incumbents is one less dollar that can be used to challenge Democrats,” the aide said."
Gee, and I thought the NRSC was prevented in bylaws from picking a side in a Republican primary.