Americans have a right to expect a meaningful dialogue over immigration practices. Not just some mindless chants about walls. Democrats had better be prepared to seriously invest in border security, albeit measures that are actually effective. As much as the problem has been overblown by President Trump — particularly given that, once again, more undocumented immigrants arrived in the U.S. last year by overstaying their visas than by crossing a border illegally — improved border security is not an unreasonable goal. Democrats have made that point repeatedly, so the time is coming for them to put up or shut up. Investments in technology, more staffing, drug-detection equipment and, yes, even physical barriers where appropriate, ought to be on the table.