Catholic immigration advocates may have been caught “flat-footed,” as one put it, by Donald J. Trump’s ferocious return to Washington, but many of them began regrouping and hashing out next steps this week at a gathering in New York. “Migrants are the unfortunate canaries in the coal mine.”“We can’t ignore the seams that are falling apart in the American project,” Bishop Seitz told the conference. Bryan Massingale, in a presentation on Sept. 16, suggested some reasons that effort will likely prove challenging for U.S. bishops. Donald Kerwin, vice president at Jesuit Refugee Service, reminded the conference that dislocation and fear are not limited to the nation’s immigrant communities. The refugee resettlement and asylum process, he said, has essentially ground to a halt under the Trump administration.