This is true of a parliamentary democracy, like the United Kingdom.
In a Parliamentary system, the executive is usually the leader of the party in the legislative branch and forms a government out of their colleagues in the legislative branch.
"Dear Momma.
Life in the infantry was hard... I'd no sleep... I gave up my stripes. Lieutenant Ackerson is meaner than a bull on a farm... By god the cold.... I'm not used to it like the white boys are. I'm only used ta' the hot Texas heat. The media usually ignores me. But they are a talkin' to the white boys like they're heroes... I don't think I'll be welcome when I come back. At least... I'm proving something for my country. That I'll be fighting. For the good of the united states."
-I hope this helps.