WASHINGTON (AP) — President Barack Obama has the upper hand in the fierce struggle over immigration now taking shape, with a veto pen ready to kill any Republican move to reverse his executive order, Democrats united behind him and GOP congressional leaders desperate to squelch talk of a government shutdown or even impeachment. With the public favoring changes in the current immigration system, the Republicans' best short-term response appears to be purely rhetorical: that the president is granting amnesty to millions, and exceeding his constitutional authority in the process.Read more on NewsOK.com