Were I a Republican strategist, I'd call for volunteers like the LDS Church, Catholic Charities, evangelical church groups, to become involved in helping the children. Perhaps even start an international relief effort to get the children from Central America into adoption agencies / foster homes starting out from there, rather than have them traverse through Mexico unaccompanied. Move these children out of refugee camps....
Instead, offer to put lots and lots of these children into good conservative homes where they will be raised to become staunch lifelong Republican voters. Then watch the Democrats suddenly scramble to change their tune.
Way past time to stop using children as pawns in adult political wars.
(an organization I'd love to start: SUOCAP.org: stop using our children as pawns.)