Trump supporters, while minority of the general electorate, dominate those who vote in Republican primaries. Many Republican elected officials who would love to rid themselves of the Donald, either to save their party or out of patriotism, grit their teeth in silence rather then set themselves up to lose their next primary.
Still we send our troops to war asking them to be willing to sacrifice life or limb for their country, Could not or congress members to willing to sacrifice their political life for their country. Unlike troops they will not end up 6 feet under, but out of a job with numerous well paying opportunities awaiting them.